Updated jsdocs. Fix phaserjs#4200

Author: photonstorm

src/sound/html5/HTML5AudioSoundManager.js

@@ -12,6 +12,15 @@ var HTML5AudioSound = require('./HTML5AudioSound');
 
 /**
  * HTML5 Audio implementation of the Sound Manager.
+ * 
+ * Note: To play multiple instances of the same HTML5 Audio sound, you need to provide an `instances` value when
+ * loading the sound with the Loader:
+ * 
+ * ```javascript
+ * this.load.audio('explosion', 'explosion.mp3', {
+ *     instances: 2
+ * });
+ * ```
  *
  * @class HTML5AudioSoundManager
  * @extends Phaser.Sound.BaseSoundManager