[ttml2] Pull Request: Fix typos s/an/a/ (#1142).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Fix typos s/an/a/ (#1142). ==
Closes #1142 

See https://github.com/w3c/ttml2/pull/1144

Received on Saturday, 17 August 2019 08:40:40 UTC