Finished off descriptions for Data, Plugins and Sound.

src/data/DataManagerPlugin.js

@@ -20,7 +20,7 @@ var PluginCache = require('../plugins/PluginCache');
  * @constructor
  * @since 3.0.0
  *
- * @param {Phaser.Scene} scene - [description]
+ * @param {Phaser.Scene} scene - A reference to the Scene that this DataManager belongs to.
  */
 var DataManagerPlugin = new Class({
 
@@ -33,7 +33,7 @@ var DataManagerPlugin = new Class({
         DataManager.call(this, scene, scene.sys.events);
 
         /**
-         * [description]
+         * The Scene that this DataManager belongs to.
          *
          * @name Phaser.Data.DataManagerPlugin#scene
          * @type {Phaser.Scene}
@@ -42,7 +42,7 @@ var DataManagerPlugin = new Class({
         this.scene = scene;
 
         /**
-         * [description]
+         * The Systems of the Scene that this DataManager belongs to.
          *
          * @name Phaser.Data.DataManagerPlugin#systems
          * @type {Phaser.Scenes.Systems}

src/plugins/BasePlugin.js

@@ -6,23 +6,17 @@
 
 var Class = require('../utils/Class');
 
-//  A Scene Level Plugin is installed into every Scene and belongs to that Scene.
-//  It can listen for Scene events and respond to them.
-//  It can map itself to a Scene property, or into the Scene Systems, or both.
-//  
-//  A Global Plugin is installed just once into the Game owned Plugin Manager.
-//  It can listen for Game events and respond to them.
-
 /**
  * @classdesc
- * [description]
+ * A Global Plugin is installed just once into the Game owned Plugin Manager.
+ * It can listen for Game events and respond to them.
  *
  * @class BasePlugin
  * @memberOf Phaser.Plugins
  * @constructor
  * @since 3.8.0
  *
- * @param {Phaser.Game} game - [description]
+ * @param {Phaser.Game} game - A reference to the Game instance this plugin is running under.
  */
 var BasePlugin = new Class({
 
@@ -33,7 +27,7 @@ var BasePlugin = new Class({
         /**
          * A handy reference to the Plugin Manager that is responsible for this plugin.
          * Can be used as a route to gain access to game systems and  events.
-         * 
+         *
          * @name Phaser.Plugins.BasePlugin#pluginManager
          * @type {Phaser.Plugins.PluginManager}
          * @protected

src/plugins/ScenePlugin.js

@@ -19,7 +19,7 @@ var Class = require('../utils/Class');
  * @constructor
  * @since 3.8.0
  *
- * @param {Phaser.Game} game - [description]
+ * @param {Phaser.Game} game - A reference to the Scene that has installed this plugin.
  */
 var ScenePlugin = new Class({
 

src/sound/BaseSoundManager.js

@@ -13,10 +13,10 @@ var NOOP = require('../utils/NOOP');
 /**
  * @callback EachActiveSoundCallback
  *
- * @param {Phaser.Sound.BaseSoundManager} manager - [description]
- * @param {Phaser.Sound.BaseSound} sound - [description]
- * @param {number} index - [description]
- * @param {Phaser.Sound.BaseSound[]} sounds - [description]
+ * @param {Phaser.Sound.BaseSoundManager} manager - The SoundManager
+ * @param {Phaser.Sound.BaseSound} sound - The active Sound
+ * @param {number} index - The index
+ * @param {Phaser.Sound.BaseSound[]} sounds - All sounds
  */
 
 /**
@@ -527,7 +527,7 @@ var BaseSoundManager = new Class({
      * @private
      * @since 3.0.0
      *
-     * @param {EachActiveSoundCallback} callback - Callback function. (sound: ISound, index: number, array: ISound[]) => void
+     * @param {EachActiveSoundCallback} callback - Callback function. (manager: Phaser.Sound.BaseSoundManager, sound: Phaser.Sound.BaseSound, index: number, sounds: Phaser.Manager.BaseSound[]) => void
      * @param {*} [scope] - Callback context.
      */
     forEachActiveSound: function (callback, scope)