Merge "Document return values of ABinderRpc_Accessor_delegateAccessor" into main am: a72b5858a0 am: 21c78a301a

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3312669

Change-Id: If5652e8d0a322e8e792247e04310dbfc6cb64b59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>