Merge "Add comments stating the configs for visible background users are not...

Merge "Add comments stating the configs for visible background users are not ready for production" into udc-dev am: 5191e0d7 am: 208bd182 am: d27bd256

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



Change-Id: I17d1806f7beef315f8ba11544094f28a2f983ebb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>