Update links to documentation.

Now that this is updated on source.android.com, linking there (and
removing current documentation).

Perhaps it would be best to have all documentation in tree, but for now,
it's on source.android.com and in a single place.

Bug: 127479533
Test: N/A
Change-Id: I958d2cd00c2b04576e4db1ef900092edbb917498
2 files changed