[webrtc-stats] Pull Request: Add note on coalescing codec stats.

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

== Add note on coalescing codec stats. ==
Fixes https://github.com/w3c/webrtc-stats/issues/614.

See https://github.com/w3c/webrtc-stats/pull/617


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