Merge "Update documentation for TV messages" into udc-dev am: 6a2bf590 am: 17639766

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



Change-Id: I51809b853d5000a64d54ee75c8cd4c6aed722720
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>