Merge "Update FLAG_ONLY_ALERT_ONCE docs" am: e3a1682e0b am: bd0f7d47eb am: cd2f1c2a9c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2062847

Change-Id: I16be1f26ff7eee520901f7ac149232ca2048328b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>