More edits to the linux build instructions.

docs/linux_arch_build_instructions.md

Index: docs/linux_arch_build_instructions.md
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-# Building Chromium on Arch Linux
-
-Generally speaking, follow the [Linux Build Instructions](linux_build_instructions.md).
-However, do the following instead to install the build dependencies:
-
-## Install the build dependencies
-
-Most of these packages are probably already installed since they're often used,
-and the `--needed` parameter ensures that up-to-date packages 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.