[webrtc-charter] Pull Request: Sundry editorial things

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

== Sundry editorial things ==
- remove unneeded comma
- add oxford commas
- fix number agreement
- consistently punctuate lists
- remove a few extra words

See https://github.com/w3c/webrtc-charter/pull/73


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