slrn documentation bug: http://slrn.sourceforge.net/docs/slrnfuns-8.html#ss8.7

In http://slrn.sourceforge.net/docs/slrnfuns-8.html#ss8.7 "This hook 
will be called whenever group mode is entered. This includes the times 
when one exists article mode back to group mode." the word "exists" 
should read "exits".

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