Fix nit in sitevar description (inconsistent in my last update).

sql/sitevars-create.sql

@@ -161,7 +161,7 @@ INSERT INTO sitevariables VALUES ('node/nfs_transport',NULL,'udp','Transport pro
 INSERT INTO sitevariables VALUES ('images/default_typelist',NULL,'','List of types to associate with an imported image when it is not appropriate to associate all existing types.',0);
 INSERT INTO sitevariables VALUES ('protogeni/use_imagetracker',NULL,'0','Enable use of the image tracker.',0);
 INSERT INTO sitevariables VALUES ('general/no_openflow',NULL,'0','Disallow topologies that specify openflow controllers, there is no local support for it.',0);
-INSERT INTO sitevariables VALUES ('phantomnet/message',NULL,'','Message to display at the top of the PhantomNet portal',0);
+INSERT INTO sitevariables VALUES ('phantomnet/message',NULL,'','Message to display at the top of the PhantomNet portal.',0);
 
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;