ietf-nntp LIST EXTENSIONS caching

[Clive D.W. Feather]

Maurizio Codogno said:
> For me it's ok, but I would like to point out that I have to 
> read it twice to understand that "MUST NOT rely" is different from
> "MUST NOT use" (cached results).

Good point.

> Could a clarificating sentence be
> added in 5.3.2, like 
>>   An NNTP client may cache results, but it MUST NOT rely on any 
>>   cached results from this command, [...]
> Notice that "may" is not written in uppercase. 

I've put:

    An NNTP client may cache the results of this command, but MUST NOT
    rely on any cached results, either from earlier in this session or
    from a previous session, remaining correct.

Does that make it clearer?

> The text in 11.6 is quite clear, btw.

Thanks.

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