Merge "libbinder: update getCallingPid docs" into main am: e615929b5b am: 73aa558f82 am: c616386f02

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2871198

Change-Id: I75b5c7f90771125ad052e9d69a2a0c64314517da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>