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

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

Change-Id: Ie261d5825cbd30db26d72ed8af749e4e8fc9ff25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>