document the ping option in the gateway examples on profiles also

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9408 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/sip_profiles/external/example.xml

@@ -30,5 +30,7 @@
   <!--<param name="contact-params" value="tport=tcp"/>-->
   <!--/// ping gateway to see if it is alive: *optional* /// -->
   <!--<param name="ping" value="15"/>-->
+  <!--send an options ping every x seconds, failure will unregister and/or mark it down-->
+  <!--<param name="ping" value="25"/>-->
   <!--</gateway>-->
 </include>

conf/sip_profiles/internal/example.xml

@@ -28,5 +28,7 @@
   <!--<param name="caller-id-in-from" value="false"/>-->
   <!--extra sip params to send in the contact-->
   <!--<param name="contact-params" value="tport=tcp"/>-->
+  <!--send an options ping every x seconds, failure will unregister and/or mark it down-->
+  <!--<param name="ping" value="25"/>-->
   <!--</gateway>-->
 </include>