[PATCH] document automatic user group removal via pw userdel

[Garrett Cooper]

Hi Hackers,
    The following is a really short patch commit request for updating
the manpage documentation for pw(8) to note that if I do the
following:

    pw user add foo
    pw user del foo

    It will remove the group foo, but if I do the following:

    pw user add foo
    pw user add bar -G foo
    pw user del foo

    It will retain the foo user group as the membership is non-zero.
This behavior is intuitive, but undocumented in the manpage as it
stands.
    Credits go to Karl Schumaker @ IronPort for the find.
Thanks,
-Garrett
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