Polish Javadoc in RequestAttributes

spring-web/src/main/java/org/springframework/web/context/request/RequestAttributes.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -135,14 +135,14 @@ public interface RequestAttributes {
 
 	/**
 	 * Return an id for the current underlying session.
-	 * @return the session id as String (never {@code null}
+	 * @return the session id as String (never {@code null})
 	 */
 	String getSessionId();
 
 	/**
 	 * Expose the best available mutex for the underlying session:
 	 * that is, an object to synchronize on for the underlying session.
-	 * @return the session mutex to use (never {@code null}
+	 * @return the session mutex to use (never {@code null})
 	 */
 	Object getSessionMutex();