Updated javadoc on StatelessAuthenticationFilter#getAuthentication

dspace-server-webapp/src/main/java/org/dspace/app/rest/security/StatelessAuthenticationFilter.java

@@ -101,17 +101,17 @@ protected void doFilterInternal(HttpServletRequest req,
     }
 
     /**
-     * This method will return a Pair instance with an Authentication object as the left side of the pair and a Boolean
-     * for the right side of the pair which will indicate whether there was an error in the OnBehalfOf parsing or not
-     * The Authentication object will be attempted to be for the eperson with the uuid in the parameter. Incase
-     * this is able to be done properly, we'll be giving a pair back with the EPerson Authentication in the left side
-     * and a false boolean as the right side.
+     * This method returns an Authentication object
+     * This Authentication object will be attempted to be for the eperson with the uuid in the parameter. Incase
+     * this is able to be done properly, we'll be returning the EPerson Authentication.
      * If the Authentication object returned is not null, we'll be logged in as this EPerson given through from the
-     * request. If the Boolean is true, we'll stop the execution and show a BadRequest error
+     * request.
+     * If something goes wrong, we'll throw an IllegalArgumentException, AccessDeniedException or AuthorizeException
+     * depending on what went wrong. This will be caught in the calling method and handled appropriately with the
+     * corresponding response codes
      * @param request       The current request
      * @param res           The current response
-     * @return              A Pair instance with the Authentication object on the left side and the boolean
-     *                      indicating errors on the right side
+     * @return              An Authentication object for the EPerson with the uuid in the parameter
      * @throws IOException  If something goes wrong
      */
     private Authentication getAuthentication(HttpServletRequest request, HttpServletResponse res)