6606019: NPE and IAE are interchanged in specification for GroupLayout.Group class

Reviewed-by: rupashka

src/share/classes/javax/swing/GroupLayout.java

@@ -1464,8 +1464,8 @@ public class GroupLayout implements LayoutManager2 {
      * <= {@code pref} <= {@code max}.
      * <p>
      * Similarly any methods that take a {@code Component} throw a
-     * {@code NullPointerException} if passed {@code null} and any methods
-     * that take a {@code Group} throw an {@code IllegalArgumentException} if
+     * {@code IllegalArgumentException} if passed {@code null} and any methods
+     * that take a {@code Group} throw an {@code NullPointerException} if
      * passed {@code null}.
      *
      * @see #createSequentialGroup