YARN-4567. Fix javadoc of ResourceManager.java failing on Java 8. (stevel)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java

@@ -1058,7 +1058,6 @@ public class ResourceManager extends CompositeService implements Recoverable {
   /**
    * Helper method to create and init {@link #activeServices}. This creates an
    * instance of {@link RMActiveServices} and initializes it.
-   * @throws Exception
    */
   protected void createAndInitActiveServices() {
     activeServices = new RMActiveServices(this);