Changed param name for mmsfromemail proxy

mbuni/doc/userguide.shtml

@@ -3341,7 +3341,7 @@ This interface should be invoked from your MTA as follows:<br><br>
 <tt>
 
 mmsfromemail -f <i>from_address</i> -t <i>recipient_address</i> 
--p <i>sender_mmsc_hostname</i> <i>conf_file</i>
+-s <i>sender_mmsc_hostname</i> <i>conf_file</i>
 </tt>
 <br/>
 <br>

mbuni/mmsc/mmsfromemail.c

@@ -462,7 +462,7 @@ static int find_own(int i, int argc, char *argv[])
 	       return 1;
 	  } else
 	       return -1;
-     else if (argv[i][1] == 'p') /* Proxy name if any. */
+     else if (argv[i][1] == 's') /* Proxy name if any. */
 	  if (i + 1  < argc) {
 	       xproxy = octstr_create(argv[i+1]);
 	       return 1;