[whatwg/streams] WebRTC endpoint pair example is out of date (Issue #1317)

### What is the issue with the Streams Standard?

The https://streams.spec.whatwg.org/#example-endpoint-pair-webrtc example is out of date. The API it mentions was removed in https://github.com/w3c/webrtc-encoded-transform/pull/64. The name of the spec has also changed.

A direct update would be something like:
> [WebRTC Encoded Transform](https://w3c.github.io/webrtc-encoded-transform/) is an example of this technique, with its [RTCRtpScriptTransformer](https://w3c.github.io/webrtc-encoded-transform/#rtcrtpscripttransformer) interface which has both `readable` and `writable` as members. 

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