docs: Bugfix & minor cleanup for "Providing Messaging for Auto"
docs: Bugfix & minor cleanup for "Providing Messaging for Auto"

Fixeds the gradle dependency line. Also added in Javadoc links for the
various support classes and methods, and other minor cleanup. See
first comment for doc stage location.

bug: 18439090

Change-Id: I7ccc892f38a644d68abc6d56d8d4377df5f864b0

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base