Added BaseSound class description

Author: pavle-goloskokovic

src/sound/BaseSound.js

@@ -11,7 +11,7 @@ var NOOP = require('../utils/NOOP');
 
 /**
  * @classdesc
- * [description]
+ * Class containing all the shared state and behaviour of a sound object, independent of the implementation.
  *
  * @class BaseSound
  * @extends EventEmitter
@@ -410,7 +410,7 @@ var BaseSound = new Class({
      *
      * @method Phaser.Sound.BaseSound#pause
      * @since 3.0.0
-     * 
+     *
      * @return {boolean} Whether the sound was paused successfully.
      */
     pause: function ()
@@ -431,7 +431,7 @@ var BaseSound = new Class({
      *
      * @method Phaser.Sound.BaseSound#resume
      * @since 3.0.0
-     * 
+     *
      * @return {boolean} Whether the sound was resumed successfully.
      */
     resume: function ()
@@ -452,7 +452,7 @@ var BaseSound = new Class({
      *
      * @method Phaser.Sound.BaseSound#stop
      * @since 3.0.0
-     * 
+     *
      * @return {boolean} Whether the sound was stopped successfully.
      */
     stop: function ()
@@ -503,7 +503,7 @@ var BaseSound = new Class({
      * @override
      * @protected
      * @since 3.0.0
-     * 
+     *
      * @param {number} time - The current timestamp as generated by the Request Animation Frame or SetTimeout.
      * @param {number} delta - The delta time elapsed since the last frame.
      */