Merge "libbinder_ndk: document dump FD ownership" am: 5bbf4e0fc0

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2645200

Change-Id: I4f0cfbaab1c35302918f5bc1586975654a0794dd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>