[Docs] fixes

docs/linux_build_instructions_prerequisites.md

 # Linux Build Instructions — Prerequisites
 
 This page describes system requirements for building Chromium on Linux.
 
 [TOC]
 
 ## System Requirements
 
 ### Linux distribution
 
@@ skipping 27 matching lines @@
 
 ### Depot tools
 
 Before setting up the environment, make sure you install the
 [depot tools](http://dev.chromium.org/developers/how-tos/depottools) first.
 
 ## Software Requirements
 
 ### Ubuntu Setup
 
-Run [build/install-build-deps.sh](build/install-build-deps.sh) The script only
+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
@@ skipping 32 matching lines @@
 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
 
 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
 
     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.
 
 ```shell
-$ sudo pacman -S --needed python perl gcc gcc-libs bison flex gperf pkgconfig \
+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.
 
 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
 
 ```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
 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
 Note 2: these packages are for 64 bit, to download the 32 bit packages,
 substitute lib64 with lib
+***
 
+*** note
 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
 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