[me-media-timed-events] new commits pushed by chrisn

The following commits were just pushed by chrisn to https://github.com/w3c/me-media-timed-events:

* Adjust Event triggering wording, fix markup issues

This update:
- moves the the sentence that starts with "This" in the Event Triggering
section to the second bullet point, since first bullet point only talks about
"in-band" media timed events.
- update the final sentence in the Event Triggering section to read as a
normative statement against the API, and not against the user agent, for
consistency with other normative statements in the list of recommendations.
- fixes markup errors in the document (mostly lists nested in paragraphs). No
actual change to the prose there.
  by François Daoust
https://github.com/w3c/me-media-timed-events/commit/9d44f29aed3bca98d1cb44999b0d50ae288d59c1