add syntax field to the api interface struct.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3000 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_module_interfaces.h

@@ -537,6 +537,8 @@ struct switch_api_interface {
 	const char *desc;
 	/*! function the api call uses */
 	switch_api_function_t function;
+	/*! an example of the application syntax */
+	const char *syntax;
 	const struct switch_api_interface *next;
 };