Polishing contribution

Closes gh-910

spring-webmvc/src/main/java/org/springframework/web/servlet/tags/form/TagWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -97,12 +97,11 @@ public class TagWriter {
 		this.writer.append(" ").append(attributeName).append("=\"")
 				.append(attributeValue).append("\"");
 	}
-	
+
 	/**
-	 * Write an empty HTML attribute with the specified name.
-	 * <p>Be sure to write all attributes <strong>before</strong> writing
-	 * any inner text or nested tags.
-	 * @throws IllegalStateException if the opening tag is closed
+	 * Variant of {@link #writeAttribute(String, String)} for writing empty HTML
+	 * attributes without a value such as {@code required}.
+	 * @since 5.3.14
 	 */
 	public void writeAttribute(String attributeName) throws JspException {
 		if (currentState().isBlockTag()) {