sst: clarify that sst_flag must be set

and typos

src/modules/sst/doc/sst_admin.xml

@@ -26,7 +26,7 @@
 		<para>The sst module provides a way to update the
 		dialog expiry timer based on the SIP INVITE/200 OK
 		Session-Expires header value. You can use the sst
-		module in an &kamailio; proxy to allow freeing of local
+		module in a &kamailio; proxy to allow freeing of local
 		resources of dead calls.</para>
 
 		<para>You can also use the sst module to validate the
@@ -156,7 +156,7 @@
 		<title><varname>enable_stats</varname> (integer)</title>
 
 		<para>If the statistics support should be enabled or
-		not. Via statistic variables, the module provide
+		not. Via statistic variables, the module provides
 		information about the dialog processing. Set it to zero to
 		disable or to non-zero to enable it.</para>
 
@@ -311,7 +311,7 @@ route {
   ...
   if (method=="INVITE") {
     setflag(5); # set the dialog flag
-    setflag(6); # Set the sst flag
+    setflag(6); # set the sst flag
   }
   ...
 }
@@ -404,7 +404,7 @@ route {
 
     <section>
 	<title>Installation and Running</title>
-	<para>Just load the module and remember to set the timeout_avp value.</para>
+	<para>Just load the module and remember to set the timeout_avp and sst_flag values.</para>
 	</section>
 </chapter>
 

src/modules/sst/sst_handlers.c

@@ -630,7 +630,7 @@ int ki_sst_check_min(struct sip_msg *msg, int flag)
 		 * First see if there is an Session-Expires: header.  If there
 		 * is, also look for a MIN-SE: header. If there is, use the
 		 * minimum value of the two to compare with srt1. All MUST not
-		 * be less then 90 and 1800 is recomended. See RCF section 4.
+		 * be less than 90 and 1800 is recomended. See RCF section 4.
 		 */
 		if ((result = parse_session_expires(msg, &se)) != parse_sst_success) {
 			if (result != parse_sst_header_not_found) {