[ttml2] Add missing punctuation in §5.2.4.1. (#1035)

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

== Add missing punctuation in §5.2.4.1. ==
Some of the sentences are lacking a FULL STOP.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1035 using your GitHub account

Received on Wednesday, 9 January 2019 02:11:12 UTC