Merge "Add detailed javadocs for PolicyUpdatedReceiver" into udc-dev am: 0bc47a55 am: e0858a14 am: fc8ee065 am: 8832d4cb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23210298



Change-Id: I24189ee3e5957fd428f346fd3498e46e9ee6d75e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>