Merge "Clarify reasons for notification removal." into udc-dev am: ebf1af85 am: 88f7b059

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24211145



Change-Id: Ib42838e093b250f1e32ca49fb63068455e627311
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>