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

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

Change-Id: Ieebadb20073057db9be2eaaa323d9ace029039ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>