bug#34289: Mention why killed groups come back anyway next time one starts gnus

[Eric Abrahamsen]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> On (info "(gnus) Subscription Commands")
> mention why killed groups come back anyway next time one starts gnus.
> See also http://jidanni.org/comp/configuration/
> Yes, it probably has to do with levels...
> OK mention that one must remove them from Mail/active too... and maybe by 
> hand from .newsrc.eld .

What mail backend is this happening with? It shouldn't be that
difficult to kill groups permanently...