GUACAMOLE-362: Fix style and error messages.

extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/ticket/TicketValidationService.java

@@ -63,6 +63,7 @@ public class TicketValidationService {
      *
      * @param ticket
      *     The ID ticket to validate and parse.
+     *
      * @param credentials
      *     The Credentials object to store retrieved username and
      *     password values in.