Add forum query about using an inverted banned_user list.

diff --git a/doc/forum/How_can_I_invert_the_banned__95__user_check__63__.mdwn b/doc/forum/How_can_I_invert_the_banned__95__user_check__63__.mdwn
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+Trying to lockdown a wiki so that it can only be edited by certain users and figured I'd just set
+
+     banned_users:
+     - !user(myadmin)
+
+in my config but it doesn't work.  I'm sure I must be doing something daft?
+
+PS: the user is authenticated via 'httpauth', would that make a difference?