Merge "Update documentation for TV messages" into udc-dev am: 6a2bf590 am: 1e68042a

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/23335838



Change-Id: Iab8309c9da13d93f22c08de5fd8b083b5703c7fc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>