More fixes to the build instructions.

This picks up various fixes noted by [email protected],
[email protected], and Twitter user @florpelier, as well as a few
more things I wanted to clean up.

[email protected], [email protected], [email protected]
BUG=

Review-Url: https://codereview.chromium.org/2543503004
Cr-Commit-Position: refs/heads/master@{#435533}
diff --git a/docs/linux_build_instructions.md b/docs/linux_build_instructions.md
index 88c4dce..fdfa120 100644
--- a/docs/linux_build_instructions.md
+++ b/docs/linux_build_instructions.md
@@ -1,8 +1,14 @@
 # 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]
 
@@ -97,7 +103,7 @@
 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`
@@ -151,7 +157,7 @@
 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