Merge "Update documentation for TV messages" into udc-dev am: 6a2bf5901e

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

Change-Id: Iffee5c7be113da9f577090fa1578bc33267e24cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>