Merge "Clarify documentation for the dimming stage." into tm-dev am: 581b7b11bd am: f7bd1f9780

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

Change-Id: I8dcc1467619412b14074c1541068a965b7b2657e
Signed-off-by: Automerger Merge Worker