document: cvsup -x

[eazy bsd]

> It would be nice if -x was documented in the cvsup manual page.
> Least in my version (cvsup-without-gui) it's missing.

maybe open a pr for it if it doesn't turn up in a
mail/pr search? it isn't really part of freebsd though.

i don't know modula3 so my recent two minute eyeball of the source
didn't turn up exactly when to use it and how it works. its presence
or absence doesn't affect the mail issue.



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