Merge "Add comments stating the configs for visible background users are not ready for production" into udc-dev am: 5191e0d7 am: b959b762 am: 432a8daa am: 36486224

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24140525



Change-Id: I8d6af0b13a7550dda864d29b7b14e7aab730f83f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>