jsdoc fixes

Author: photonstorm

src/gameobjects/graphics/GraphicsCreator.js

@@ -15,7 +15,7 @@ var Graphics = require('./Graphics');
  * @method Phaser.GameObjects.GameObjectCreator#graphics
  * @since 3.0.0
  *
- * @param {object} config - [description]
+ * @param {object} [config] - [description]
  *
  * @return {Phaser.GameObjects.Graphics} The Game Object that was created.
  */

src/gameobjects/graphics/GraphicsFactory.js

@@ -15,7 +15,7 @@ var GameObjectFactory = require('../GameObjectFactory');
  * @method Phaser.GameObjects.GameObjectFactory#graphics
  * @since 3.0.0
  *
- * @param {object} config - [description]
+ * @param {object} [config] - [description]
  * 
  * @return {Phaser.GameObjects.Graphics} The Game Object that was created.
  */

src/input/Pointer.js

@@ -270,7 +270,7 @@ var Pointer = new Class({
      * @since 3.0.0
      *
      * @param {Phaser.Cameras.Scene2D.Camera} camera - [description]
-     * @param {(Phaser.Math.Vector2|object)} output - [description]
+     * @param {(Phaser.Math.Vector2|object)} [output] - [description]
      *
      * @return {(Phaser.Math.Vector2|object)} [description]
      */