msrp: fixed module name in event_callback example

src/modules/msrp/doc/msrp_admin.xml

@@ -233,7 +233,7 @@ modparam("msrp", "use_path_addr", "msrp.kamailio.org:5061")
 		<title>Set <varname>event_callback</varname> parameter</title>
 		<programlisting format="linespecific">
 ...
-modparam("htable", "event_callback", "ksr_msrp_event")
+modparam("msrp", "event_callback", "ksr_msrp_event")
 ...
 -- event callback function implemented in Lua
 function ksr_msrp_event(evname)