Remove one layer of "WebVTT cue settings" sections

The duplicate section title resulted in a section id #webvtt-cue-settings-1
Run format.py
Remove dependency links from the snapshot spec, to preempt objections

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27142
Merge pull request #166 from foolip/remove-snapshot-links

Remove dependency links from the snapshot spec, to preempt objections
Merge pull request #165 from foolip/webvtt-cue-settings-1

Remove one layer of "WebVTT cue settings" sections