message: updating comment to reflect that it extends Tone.Source
diff: @@ -6,7 +6,7 @@ function (Tone) {
  * Granular Synthesis enables you to adjust pitch and playback rate independently. The grainSize is the
  * amount of time each small chunk of audio is played for and the overlap is the
  * amount of crossfading transition time between successive grains.
  - * @extends {Tone}
  + * @extends {Tone.Source}
  * @param {String|Tone.Buffer} url The url to load, or the Tone.Buffer to play.
  * @param {Function=} callback The callback to invoke after the url is loaded.
  */
  