Remove vestigial reference to CollectedClientData/clientExtensions

[selfissued]

Fixes #828

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[emlun]

The text now reads:

The client extension input for the extension is used an input to this client processing. For each supported client extension, the client adds an entry to this dictionary with the extension identifier as the key, and the extension’s client extension input as the value.

However, "this dictionary" is now undefined. Actually, the whole second sentence is now outdated because the client no longer records the client extension inputs in the response. Perhaps this instead needs to say that the RP adds the input values to the extensions parameter?

By the way, there's also an unrelated pre-existing typo in the first sentence: "is used an input"

[equalsJeffH]

agree w/@emlun

[equalsJeffH]

LGTM, thanks Mike!

[emlun]

👍

[rlin1]

Note to emlun: in the respective processing rules we say "Let clientExtensions be a new map and let authenticatorExtensions be a new map." etc.
So we are referring to that clientExtensions map (i.e. some "local" variable defined in the processing sections).