[NNTP] Extensions drafts

[Ken Murchison]

I was sent a message offline about the fact that the extension drafts 
discuss some of the generic responses (namely 480, 483, 504), but don't 
list them in the formal syntax/response sections.  I realize that these 
responses are valid for *any* command, but I can see the point that 
since we're outside of the base document that they it may be worth 
listing them as valid responses and mentioning that they are defined in 
the base doc.  Thoughts?

-- 
Kenneth Murchison     Oceana Matrix Ltd.
Software Engineer     21 Princeton Place
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