Merge "Improve Rust documentation of Binder thread pool." am: 7ed4fc1d39 am: b09fd75200

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

Change-Id: I3d51b1124631932dbd54f26c50fcc49db69b53b6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>