Re: [webrtc-pc] Clarify the definition of "playout" for `RTCRtpContributingSource`. (#2172)

I don't believe that it should be defined in terms of "jitter buffer". There are too many other parts (e.g. "frame spacing", "decoding", "rendering delay", "sync buffer", etc.) that may or may not be included in "jitter buffer" depending on implementation.

The best definition seems to be:

> Audio or video frame is delivered to RTCRtpReceiver's MediaStreamTrack.

It's more or less identical to the existing definition, but gets rid of the word "playout" since the latter only causes confusion.

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