Merge "Explain the -hide params passed to doclava" into main am: a8b4f6f7af am: c457428cf9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2796300

Change-Id: Ic19d44427dc942b101fcab3c72b3634a6deb935f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>