[ttml2] Fix name of tts:luminanceGain in schemas.

skynavga has just created a new issue for https://github.com/w3c/ttml2:

== Fix name of tts:luminanceGain in schemas. ==
The schemas currently have `tts:luminance` instead of `tts:luminanceGain`.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/975 using your GitHub account

Received on Wednesday, 8 August 2018 04:12:51 UTC