message: fixing docs
  fixes
  [skip ci]
diff: @@ -41,7 +41,7 @@ function(Tone){
  /**
  * The carrier's envelope
  - * @type {Tone.Oscillator}
  + * @type {Tone.AmplitudeEnvelope}
  */
  this.envelope = this._carrier.envelope.set(options.envelope);
  @@ -62,7 +62,7 @@ function(Tone){
  /**
  * The modulator's envelope
  - * @type {Tone.Oscillator}
  + * @type {Tone.AmplitudeEnvelope}
  */
  this.modulationEnvelope = this._modulator.envelope.set(options.modulationEnvelope);
  