TTML2 Editing Status

All Issues and PRs marked for CR1 milestone [1] have been addressed or
moved to CR2 [2] or CR1 DoC Processing [3] milestones, where the latter [3]
is now in the hands of the chair.

Thanks to members for their help in reviewing and commenting on Issues and
PRs.

[1] https://github.com/w3c/ttml2/milestone/1
[2] https://github.com/w3c/ttml2/milestone/2
[3] https://github.com/w3c/ttml2/milestone/3