#71 Document restriction against training on Sent Items folder

[Tony Meyer]

Bob Coe on spambayes@python.org.
> If you think training on the "sent" folder is a bad
> idea, say so in the installation instructions; but don't
> incorporate another unexpected restriction.

It seems that he's asking for the restriction to be lifted
and changed into a suggestion in the documentation
instead.

Lifting the restriction seems unlikely to have any effect,
apart from maybe confusing people if they try to
manually train on messages in it (since they'll get
the "No filterable items" message).

[Mark Hammond]

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I agree that this is a request for doc change, as we wont
lift the restriction (mainly for the reason Tony mentioned).
All we need now is somewhere to put these docs (about.html
isn't right, and there is currently no better place)