add wiki links in config files for those looking to get help with those configs/modules

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6666 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/autoload_configs/conference.conf.xml

+<!-- http://wiki.freeswitch.org/wiki/Mod_conference --> 
 <!-- None of these paths are real if you want any of these options you need to really set them up -->
 <configuration name="conference.conf" description="Audio Conference">
   <!-- Advertise certain presence on startup . -->

conf/dialplan/default.xml

+<!-- http://wiki.freeswitch.org/wiki/Dialplan_XML --> 
 <include>
   <context name="default">
     <extension name="intercept">

conf/dialplan/public.xml

+<!-- http://wiki.freeswitch.org/wiki/Dialplan_XML -->
 <include>
   <context name="public">
 

conf/sip_profiles/default.xml

+<!-- http://wiki.freeswitch.org/wiki/Sofia -->
 <profile name="default">
   <!--aliases are other names that will work as a valid profile name for this profile-->
   <aliases>

conf/sip_profiles/nat.xml

+<!-- http://wiki.freeswitch.org/wiki/Sofia -->
 <profile name="nat">
   <gateways>
     <X-PRE-PROCESS cmd="include" data="nat/*.xml"/>

conf/sip_profiles/outbound.xml

+<!-- http://wiki.freeswitch.org/wiki/Sofia --> 
 <profile name="outbound">
   <!-- This profile is only for outbound registrations to providers -->
   <gateways>