Finished FB docs

Author: photonstorm

plugins/fbinstant/src/AdInstance.js

@@ -4,6 +4,15 @@
  * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
  */
 
+/**
+ * @typedef {object} AdInstance
+ *
+ * @property {any} instance - Represents an instance of an ad.
+ * @property {string} placementID - The Audience Network placement ID of this ad instance.
+ * @property {boolean} shown - Has this ad already been shown in-game?
+ * @property {boolean} video - Is this a video ad?
+ */
+
 var AdInstance = function (instance, video)
 {
     return {