Merge "Explain the -hide params passed to doclava" into main am: a8b4f6f7af am: 05a8719979 am: a7b8f8ce0e

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

Change-Id: I064d3ecd746f796eb0c3e75d10e9373fa807d335
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>