Remove unnecessary non-Javadoc keyword

Issue gh-1946

spring-session-docs/src/test/java/docs/http/AbstractHttpSessionListenerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2019 the original author or authors.
+ * Copyright 2014-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -75,8 +75,6 @@ public abstract class AbstractHttpSessionListenerTests {
 		private SessionDestroyedEvent event;
 
 		/*
-		 * (non-Javadoc)
-		 *
 		 * @see org.springframework.context.ApplicationListener#onApplicationEvent(org.
 		 * springframework.context.ApplicationEvent)
 		 */