[webrtc-stats] Possibly outdated text on codec.channels (#615)

jan-ivar has just created a new issue for https://github.com/w3c/webrtc-stats:

== Possibly outdated text on codec.channels ==
webrtc-stats [channels](https://w3c.github.io/webrtc-stats/#dom-rtccodecstats-channels) says: _"Use 2 for stereo, missing for most other cases."_ (2014)
webrtc-pc [channels](https://w3c.github.io/webrtc-pc/#dom-rtcrtpcodeccapability-channels) capability says: _"If present, indicates the maximum number of channels (mono=1, stereo=2)."_ (2015)
webrtc-pc [channels](https://w3c.github.io/webrtc-pc/#dom-rtcrtpcodecparameters-channels) parameter says: _"When present, indicates the number of channels (mono=1, stereo=2)."_

When I [test](https://jsfiddle.net/jib1/moz71L7h/), Chrome returns `channels: 1` in stats for mono, so I think we should update this spec to match.

Please view or discuss this issue at https://github.com/w3c/webrtc-stats/issues/615 using your GitHub account


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