sr: small spelling fix in default sr cfg

etc/sip-router.cfg

@@ -364,7 +364,7 @@ route[REGISTRAR]
 		#	drop;
 		#}
 
-		# everyhting is fine so lets store the binding
+		# everything is fine so lets store the binding
 		if (!save_contacts("location")) {
 			sl_reply("400", "Invalid REGISTER Request");
 			drop;