modules/sipt/doc: corrected documentation typos

modules/sipt/doc/sipt_admin.xml

@@ -59,14 +59,14 @@ sipt_destination($rU, 31, 4);
 	<section>
 		<title><function moreinfo="none">sipt_get_hop_count()</function></title>
 		<para>
-			Returns the value of the Hop Coutner for the IAM message if it exists.
+			Returns the value of the Hop Counter for the IAM message if it exists.
 			Returns -1 if there isn't a hop counter.
 		</para>
 		<example>
 			<title><function moreinfo="none">sipt_get_hop_counter()</function> usage</title>
 			<programlisting format="linespecific">
 ...
-# get the hop couter and update the Max-Forwards header if it exists
+# get the hop counter and update the Max-Forwards header if it exists
 $avp(s:hop) = sipt_get_hop_counter();
 if($avp(s:hop) > 0)
 {