8234921: Add DirectionalLight to the selection of 3D light types

modules/javafx.graphics/src/main/java/javafx/scene/DirectionalLight.java

@@ -49,7 +49,7 @@
  * cannot be attenuated. A decrease in intensity can be achieved by using a darker color. The sun is a common light
  * source that can be simulated with this light type.
  *
- * @since 17
+ * @since 18
  * @see PhongMaterial
  */
 public class DirectionalLight extends LightBase {