Update documentation for some regions.

Add Makefile to build overlay-private for private API docs.

BUG=None
TEST=Unit tests

Change-Id: I12a4bae73ff7119f47b7a75686ca032a65f6cd7a
Reviewed-on: https://chromium-review.googlesource.com/180300
Reviewed-by: Jon Salz <jsalz@chromium.org>
Commit-Queue: Jon Salz <jsalz@chromium.org>
Tested-by: Jon Salz <jsalz@chromium.org>
2 files changed