[NNTP] Changes from RFC 977 / RFC 2980

[Clive D.W. Feather]

I wrote in Appendix D:

>    o  The rules for article numbering (Section 6) have been clarified.

I've added "(also see Section 6.1.1.2)" because that's got quite a lot in
it.

-- 
Clive D.W. Feather  | Work:  <clive at demon.net>   | Tel:    +44 20 8495 6138
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