TTML10SE Update

I've updated the ED at [1] in order to revert the prior addition of a draft
HTML/CSS formatting model (which we agreed to defer to 1.1 at last weeks
"mini-meeting"). In order to wrap up the ED, I'd like someone to provide
sample example fragments that can be used in Appendix N [2].

[1] https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html
[2]
https://dvcs.w3.org/hg/ttml/raw-file/default/ttml10/spec/ttaf1-dfxp.html#common-styling