More fixes to the build instructions.

docs/linux_build_instructions.md

 # Checking out and building Chromium on Linux
 
+There are instructions for other platforms linked from the 
+[get the code](get_the_code.md) page.
+
 **See also [the old version of this page](old_linux_build_instructions.md).**
 
-Google employee? See [go/building-chrome](https://goto.google.com/building-chrome) instead.
+## Instructions for Google Employees
+
+Are you a Google employee? See
+[go/building-chrome](https://goto.google.com/building-chrome) instead.
 
 [TOC]
 
 ## System requirements
 
 *   A 64-bit Intel machine with at least 8GB of RAM. More than 16GB is highly
     recommended.
 *   At least 100GB of free disk space.
 *   You must have Git and Python installed already.
 
@@ skipping 74 matching lines @@
 
 ```shell
 $ gclient runhooks
 ```
 
 *Optional*: You can also [install API
 keys](https://www.chromium.org/developers/how-tos/api-keys) if you want your
 build to talk to some Google services, but this is not necessary for most
 development and testing purposes.
 
-## Setting up the Build
+## Setting up the build
 
 Chromium uses [Ninja](https://ninja-build.org) as its main build tool along
 with a tool called [GN](../tools/gn/docs/quick_start.md) to generate `.ninja`
 files. You can create any number of *build directories* with different
 configurations. To create a build directory, run:
 
 ```shell
 $ gn gen out/Default
 ```
 
@@ skipping 33 matching lines @@
 ```shell
 $ out/Default/chrome
 ```
 
 ## Running test targets
 
 You can run the tests in the same way. You can also limit which tests are
 run using the `--gtest_filter` arg, e.g.:
 
 ```shell
-$ ninja -C out/Default unit_tests --gtest_filter="PushClientTest.*"
+$ out/Default/unit_tests --gtest_filter="PushClientTest.*"
 ```
 
 You can find out more about GoogleTest at its
 [GitHub page](https://github.com/google/googletest).
 
 ## Update your checkout
 
 To update an existing checkout, you can run
 
 ```shell
@@ skipping 46 matching lines @@
 *   Want to use Eclipse as your IDE? See
     [LinuxEclipseDev](linux_eclipse_dev.md).
 *   Want to use your built version as your default browser? See
     [LinuxDevBuildAsDefaultBrowser](linux_dev_build_as_default_browser.md).
 
 ### Next Steps
 
 If you want to contribute to the effort toward a Chromium-based browser for
 Linux, please check out the [Linux Development page](linux_development.md) for
 more information.