Polishing contribution

See gh-24287

spring-beans/src/main/java/org/springframework/beans/factory/parsing/ParseState.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -53,7 +53,7 @@ public final class ParseState {
 	}
 
 	/**
-	 * Create a new {@code ParseState} whose {@link LinkedList} is an {@link Object#clone clone}
+	 * Create a new {@code ParseState} whose {@link LinkedList} is a {@link Object#clone clone}
 	 * of that of the passed in {@code ParseState}.
 	 */
 	@SuppressWarnings("unchecked")

spring-beans/src/main/java/org/springframework/beans/factory/parsing/ReaderContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.