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

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

Change-Id: I0bdb3becee3de581c56f3431e76aa75d6b726713
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>