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

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

Change-Id: I1806f41579d37eee9b005f60a59ed1876a03ab4e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>