[webrtc-encoded-transform] Document the old API that was removed in #64 (#105)

alvestrand has just created a new issue for https://github.com/w3c/webrtc-encoded-transform:

== Document the old API that was removed in #64 ==
The old API needs to be documented somewhere that's findable from the spec, at least until all browsers implement the new one.

Suggestion: Add a link that goes to an old version of the spec.


Please view or discuss this issue at https://github.com/w3c/webrtc-encoded-transform/issues/105 using your GitHub account


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