[Docs] Another round of stylistic fixes.

docs/linux_build_instructions_prerequisites.md

+# Linux Build Instructions — Prerequisites
+
 This page describes system requirements for building Chromium on Linux.
 
+[TOC]
 
+## System Requirements
 
-# System Requirements
+### Linux distribution
 
-## Linux distribution
-You should be able to build Chromium on any reasonably modern Linux distribution, but there are a lot of distributions and we sometimes break things on one or another. Internally, our development platform has been a variant of Ubuntu 14.04 (Trusty Tahr); we expect you will have the most luck on this platform, although directions for other popular platforms are included below.
+You should be able to build Chromium on any reasonably modern Linux
+distribution, but there are a lot of distributions and we sometimes break things
+on one or another. Internally, our development platform has been a variant of
+Ubuntu 14.04 (Trusty Tahr); we expect you will have the most luck on this
+platform, although directions for other popular platforms are included below.
 
-## Disk space
-It takes about 10GB or so of disk space to check out and build the source tree. This number grows over time.
+### Disk space
 
-## Memory space
-It takes about 8GB of swap file to link chromium and its tests. If you get an out-of-memory error during the final link, you will need to add swap space with swapon. It's recommended to have at least 4GB of memory available for building a statically linked debug build. Dynamic linking and/or building a release build lowers memory requirements. People with less than 8GB of memory may want to not build tests since they are quite large.
+It takes about 10GB or so of disk space to check out and build the source tree.
+This number grows over time.
 
-## 64-bit Systems
-Chromium can be compiled as either a 32-bit or 64-bit application. Chromium requires several system libraries to compile and run. While it is possible to compile and run a 32-bit Chromium on 64-bit Linux, many distributions are missing the necessary 32-bit libraries, and will result in build or run-time errors.
+### Memory space
 
-## Depot tools
-Before setting up the environment, make sure you install the [depot tools](http://dev.chromium.org/developers/how-tos/depottools) first.
+It takes about 8GB of swap file to link chromium and its tests. If you get an
+out-of-memory error during the final link, you will need to add swap space with
+swapon. It's recommended to have at least 4GB of memory available for building a
+statically linked debug build. Dynamic linking and/or building a release build
+lowers memory requirements. People with less than 8GB of memory may want to not
+build tests since they are quite large.
 
-# Software Requirements
+### 64-bit Systems
 
-## Ubuntu Setup
-Run [build/install-build-deps.sh](https://chromium.googlesource.com/chromium/chromium/+/trunk/build/install-build-deps.sh) The script only supports current releases as listed on https://wiki.ubuntu.com/Releases.
+Chromium can be compiled as either a 32-bit or 64-bit application. Chromium
+requires several system libraries to compile and run. While it is possible to
+compile and run a 32-bit Chromium on 64-bit Linux, many distributions are
+missing the necessary 32-bit libraries, and will result in build or run-time
+errors.
 
-Building on Linux requires software not usually installed with the distributions.
-The script attempts to automate installing the required software.  This script is used to set up the canonical builders, and as such is the most up to date reference for the required prerequisites.
+### Depot tools
 
-## Other distributions
-Note: Other distributions are not officially supported for building and the instructions below might be outdated.
+Before setting up the environment, make sure you install the
+[depot tools](http://dev.chromium.org/developers/how-tos/depottools) first.
 
-### Debian Setup
+## Software Requirements
+
+### Ubuntu Setup
+
+Run [build/install-build-deps.sh](build/install-build-deps.sh) The script only
+supports current releases as listed on https://wiki.ubuntu.com/Releases.
+
+Building on Linux requires software not usually installed with the
+distributions.
+
+The script attempts to automate installing the required software. This script is
+used to set up the canonical builders, and as such is the most up to date
+reference for the required prerequisites.
+
+### Other distributions
+
+Note: Other distributions are not officially supported for building and the
+instructions below might be outdated.
+
+#### Debian Setup
 
 Follow the Ubuntu instructions above.
 
-If you want to install the build-deps manually, note that the original packages are for Ubuntu. Here are the Debian equivalents:
-  * libexpat-dev -> libexpat1-dev
-  * freetype-dev -> libfreetype6-dev
-  * libbzip2-dev -> libbz2-dev
-  * libcupsys2-dev -> libcups2-dev
+If you want to install the build-deps manually, note that the original packages
+are for Ubuntu. Here are the Debian equivalents:
 
-Additionally, if you're building Chromium components for Android, you'll need to install the package: lib32z1
+*   libexpat-dev -> libexpat1-dev
+*   freetype-dev -> libfreetype6-dev
+*   libbzip2-dev -> libbz2-dev
+*   libcupsys2-dev -> libcups2-dev
 
-### openSUSE Setup
+Additionally, if you're building Chromium components for Android, you'll need to
+install the package: lib32z1
 
-For openSUSE 11.0 and later, see [Linux openSUSE Build Instructions](LinuxOpenSuseBuildInstructions.md).
+#### openSUSE Setup
 
-### Fedora Setup
+For openSUSE 11.0 and later, see
+[Linux openSUSE Build Instructions](linux_open_suse_build_instructions.md).
+
+#### Fedora Setup
 
 Recent systems:
-```
+
+```shell
 su -c 'yum install subversion pkgconfig python perl gcc-c++ bison \
 flex gperf nss-devel nspr-devel gtk2-devel glib2-devel freetype-devel \
 atk-devel pango-devel cairo-devel fontconfig-devel GConf2-devel \
 dbus-devel alsa-lib-devel libX11-devel expat-devel bzip2-devel \
 dbus-glib-devel elfutils-libelf-devel libjpeg-devel \
 mesa-libGLU-devel libXScrnSaver-devel \
 libgnome-keyring-devel cups-devel libXtst-devel libXt-devel pam-devel'
 ```
 
-The msttcorefonts packages can be obtained by following the instructions present here: http://www.fedorafaq.org/#installfonts
+The msttcorefonts packages can be obtained by following the instructions present
+here: http://www.fedorafaq.org/#installfonts
 
 For the optional packages:
-  * php-cgi is provided by the php-cli package
-  * wdiff doesn't exist in Fedora repositories, a possible alternative would be dwdiff
-  * sun-java6-fonts doesn't exist in Fedora repositories, needs investigating
+*   php-cgi is provided by the php-cli package
+*   wdiff doesn't exist in Fedora repositories, a possible alternative would be
+    dwdiff
+*   sun-java6-fonts doesn't exist in Fedora repositories, needs investigating
 
-```
-su -c 'yum install httpd mod_ssl php php-cli wdiff'
-```
+    su -c 'yum install httpd mod_ssl php php-cli wdiff'
 
-### Arch Linux Setup
-Most of these packages are probably already installed since they're often used, and the parameter --needed ensures that packages up to date are not reinstalled.
-```
-$ sudo pacman -S --needed python perl gcc gcc-libs bison flex gperf pkgconfig nss \
-  alsa-lib gconf glib2 gtk2 nspr ttf-ms-fonts freetype2 cairo dbus \
+
+#### Arch Linux Setup
+
+Most of these packages are probably already installed since they're often used,
+and the parameter --needed ensures that packages up to date are not reinstalled.
+
+```shell
+$ sudo pacman -S --needed python perl gcc gcc-libs bison flex gperf pkgconfig \
+  nss alsa-lib gconf glib2 gtk2 nspr ttf-ms-fonts freetype2 cairo dbus \
   libgnome-keyring
 ```
 
 For the optional packages on Arch Linux:
-  * php-cgi is provided with pacman
-  * wdiff is not in the main repository but dwdiff is. You can get wdiff in AUR/yaourt
-  * sun-java6-fonts do not seem to be in main repository or AUR.
 
-For a successful build, add `'remove_webcore_debug_symbols': 1,` to the variables-object in include.gypi. Tested on 64-bit Arch Linux.
+*   php-cgi is provided with pacman
+*   wdiff is not in the main repository but dwdiff is. You can get wdiff in
+    AUR/yaourt
+*   sun-java6-fonts do not seem to be in main repository or AUR.
 
-TODO: Figure out how to make it build with the WebCore debug symbols. `make V=1` can be useful for solving the problem.
+For a successful build, add `'remove_webcore_debug_symbols': 1,` to the
+variables-object in include.gypi. Tested on 64-bit Arch Linux.
 
+TODO: Figure out how to make it build with the WebCore debug symbols. `make V=1`
+can be useful for solving the problem.
 
-### Mandriva setup
+#### Mandriva setup
 
-```
-urpmi lib64fontconfig-devel lib64alsa2-devel lib64dbus-1-devel lib64GConf2-devel \
-lib64freetype6-devel lib64atk1.0-devel lib64gtk+2.0_0-devel lib64pango1.0-devel \
-lib64cairo-devel lib64nss-devel lib64nspr-devel g++ python perl bison flex subversion \
-gperf
+```shell
+urpmi lib64fontconfig-devel lib64alsa2-devel lib64dbus-1-devel \
+lib64GConf2-devel lib64freetype6-devel lib64atk1.0-devel lib64gtk+2.0_0-devel \
+lib64pango1.0-devel lib64cairo-devel lib64nss-devel lib64nspr-devel g++ python \
+perl bison flex subversion gperf
 ```
 
-Note 1: msttcorefonts are not available, you will need to build your own (see instructions, not hard to do, see http://code.google.com/p/chromium/wiki/MandrivaMsttcorefonts ) or use drakfont to import the fonts from a windows installation
+Note 1: msttcorefonts are not available, you will need to build your own (see
+instructions, not hard to do, see
+[mandriva_msttcorefonts.md](mandriva_msttcorefonts.md)) or use drakfont to
+import the fonts from a windows installation
 
-Note 2: these packages are for 64 bit, to download the 32 bit packages, substitute lib64 with lib
+Note 2: these packages are for 64 bit, to download the 32 bit packages,
+substitute lib64 with lib
 
-Note 3: some of these packages might not be explicitly necessary as they come as dependencies, there is no harm in including them however.
+Note 3: some of these packages might not be explicitly necessary as they come as
+dependencies, there is no harm in including them however.
 
-Note 4: to build on 64 bit systems use, instead of GYP\_DEFINES=target\_arch=x64 , as mentioned in the general notes for building on 64 bit:
+Note 4: to build on 64 bit systems use, instead of
+`GYP_DEFINES=target_arch=x64`, as mentioned in the general notes for building on
+64 bit:
 
-```
+```shell
 export GYP_DEFINES="target_arch=x64"
 gclient runhooks --force
 ```
 
-### Gentoo setup
-```
-emerge www-client/chromium 
-```
+#### Gentoo setup
+
+    emerge www-client/chromium