Update Gaia API documents for #7c1e22ab367b87cebfa70da0aef7b7f9d0326d6d
    Merge pull request #14455 from ethantseng/rtsp/bug928332

Bug 928332 - [RTSP][Gaia] Support RTSP in Video apps., r=johnhu
(cherry picked from commit ff703bf2c0baaf06b2b74144bec9b9cc99f22404)