Merge "Update setUserAgentString API description" into main am: fc31e4ed5a am: e83a86c7db am: e676aa77eb

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2769265

Change-Id: Id77528ef9bf90fd098416f8a15bf7ad9f4b9bc3d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>