[webrtc-pc] Pull Request: Document substantive changes since Rec as candidate amendments

dontcallmedom has just submitted a new pull request for https://github.com/w3c/webrtc-pc:

== Document substantive changes since Rec as candidate amendments ==
This pull request is a proposed approach to document the various substantive changes we've brought to the spec since it was published as a Recommendation to make it acceptable as part of the process to amend W3C recommendations.



See https://github.com/w3c/webrtc-pc/pull/2713


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