Channel ID and Token Binding are undefined

[sleevi]

http-extensions/draft-ietf-httpbis-rfc6265bis.md

Line 1974 in 5469d51

socket pooling, Token Binding, and Channel ID all offer explicit methods of

"Token Binding" and "Channel ID" are undefined here.

It's unclear whether informative references, such as to RFC 8471 and draft-balfanz-tls-channelid would be useful, or if just rewording this would be better.

[sleevi]

@mikewest Looks like I can't label this as 6265bis for you.