Javadoc

- Close HTML tags
- Remove dead inline comments

src/main/java/org/apache/commons/collections4/ArrayStack.java

@@ -72,6 +72,7 @@ public ArrayStack(final int initialSize) {
      * <p>
      * This method exists for compatibility with {@link java.util.Stack}.
      * New users of this class should use {@code isEmpty} instead.
+     * </p>
      *
      * @return true if the stack is currently empty
      */