Add note to make sure the DYNDNS Event has "Enabled" set to "Yes".

docs/dyndns.txt

             Synchronet Dynamic Domain Name System (DynDNS) Service
             ======================================================
 
+$Id$
 
 Introduction
 ------------
@@ -64,6 +65,8 @@ Directions:
    If you have a static IP address, one run (update) per month should be
    sufficient.
 
+   Make sure the "Enabled" is set to "Yes".
+
 4. After saving your changes in SCFG, and verifying that the BBS/Telnet Server
    has recycled, check the event log window or console output to verify that
    the "DYNDNS" event has executed. You can force the event to execute with