Update the build instructions to be consistent.

docs/get_the_code.md

Index: docs/get_the_code.md
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+# Get the code: check out, build, and run Chromium. 
+
+Chromium supports building on Windows, Mac and Linux host systems.
+
+Linux is required for building Android, and a Mac is required for building iOS.
+
+The process for building Chrome is generally the same on all platforms, but
+each platform has a few quirks. In order to keep you from having to jump
+all over the place, we have a self-contained page for each configuration
+you might want to build:
+
+* [Android](android_build_instructions.md)
+* [Cast](cast_build_instructions.md)
+* [ChromeOS](chromeos_build_instructions.md)
+* [iOS](ios_build_instructions.md)
+* [Linux](linux_build_instructions.md)
+* [Mac](mac_build_instructions.md)
+* [Windows](windows_build_instructions.md)