add help for flexmail

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The help on *send currently says, "Configures email to be sent when card in set is created."

Suggest adding, "Learn more about flexible email."

This is card content (on english wagn).

we're very soon going to need wagneering tickets, I think.

--Ethan McCutchen.....Sun Jan 09 13:08:34 -0800 2011

Duh. Well, in this case I would've just fixed it if I'd remembered it was just Wagneering.

--John Abbe.....Sun Jan 09 14:08:20 -0800 2011