Merge "Clarify documentation for the dimming stage." into tm-dev am: 581b7b11bd

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/17263930

Change-Id: I34da9aa5c2b30d6dcbfdcf77cb15bedc78e8c74e
Signed-off-by: Automerger Merge Worker