Merge "Update documentation for TV messages" into udc-dev am: 6a2bf5901e am: c662f27412 am: 9330361403 am: 931172c14f

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

Change-Id: Ie9d308f2d05c2bab45c878bbabdaeff7f500dba8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>