Improved method comment.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@1460 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/SessionManager.java

@@ -754,7 +754,9 @@ public class SessionManager extends BasicModule {
     }
 
     /**
-     * Returns the session responsible for this JID data.
+     * Returns the session responsible for this JID data. The returned Session may have never sent
+     * an available presence (thus not have a route) or could be a Session that hasn't
+     * authenticated yet (i.e. preAuthenticatedSessions). 
      *
      * @param username the username of the JID.
      * @param domain the username of the JID.