Merge "Add available since doc" into udc-dev am: e1788e69

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/22122947



Change-Id: I71728c4f1a36679567918955e95226149d95ed29
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>