* Make note in help for 'set' that notify-time is only used when server does not support MONITOR

doc/help.txt

@@ -1608,7 +1608,8 @@ See also: reload, backup
                          of jupenick.
 [S]  $bnick$b            The bot's preferred nickname on IRC. It will auto rotate and append
                          'altchars' on the end if taken.
-[N]  $bnotify-time$b     The number of seconds between server notify checks for nick.
+[N]  $bnotify-time$b     The number of seconds between server notify checks for nick, if
+                          the server does not support MONITOR.
  
 [B]  $birc-autoaway$b    Should the bot go away auto?