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

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



Change-Id: Ifc03c26f578e1c125eb8f6632ce8f96b4531f88b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>