YARN-11424. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/rmadmin/FederationRMAdminInterceptor.java

@@ -820,9 +820,11 @@ public ThreadPoolExecutor getExecutorService() {
    * The request contains the id of to deregister sub-cluster.
    * @return Response from deregisterSubCluster.
    * @throws YarnException exceptions from yarn servers.
+   * @throws IOException if an IO error occurred.
    */
   @Override
-  public DeregisterSubClusterResponse deregisterSubCluster(DeregisterSubClusterRequest request) throws YarnException, IOException {
+  public DeregisterSubClusterResponse deregisterSubCluster(DeregisterSubClusterRequest request)
+      throws YarnException, IOException {
 
     if (request == null) {
       routerMetrics.incrDeregisterSubClusterFailedRetrieved();