Merge "Correct return codes in documentation" am: 6439a233 am: 4c2b39d7 am: 4c66450c

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2305611



Change-Id: I5d79c480b350f37b3c9722851728076149beeb51
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>