Merge "Improve Rust documentation of Binder thread pool." am: 7ed4fc1d39

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2636289

Change-Id: I6ead49aae89a38688eaebc52bcc91b62cb1ef8d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>