[webrtc-stats] Pull Request: editorial: clarify relayProtocol stats

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

== editorial: clarify relayProtocol stats ==
following
  https://github.com/w3c/webrtc-pc/pull/2763

See https://github.com/w3c/webrtc-stats/pull/657


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