ComboBoxModel documentation refers to a nonexistant type

Summary

Rectify the javadoc anomaly that javax.swing.ComboBoxModel extends ListDataModel, where in reality, it extends ListModel.

Problem

javadoc of javax.swing.ComboBoxModel incorrectly specifies it extends "ListDataModel" but actually extends ListModel.

Solution

Rectified the javadoc to specify javax.swing.ComboBoxModel extends ListModel.

Specification

 package javax.swing;

 /**
- * A data model for a combo box. This interface extends <code>ListDataModel</code>
+ * A data model for a combo box. This interface extends <code>ListModel</code>
  * and adds the concept of a <i>selected item</i>. The selected item is generally
  * the item which is visible in the combo box display area.
  * <p>
public interface ComboBoxModel<E> extends ListModel<E> {