small doc enhancements for chorus, distortion, and FFT

Tone/component/analysis/FFT.ts

@@ -13,6 +13,7 @@ export interface FFTOptions extends MeterBaseOptions {
 
 /**
  * Get the current frequency data of the connected audio source using a fast Fourier transform.
+ * Read more about FFT algorithms on [Wikipedia] (https://en.wikipedia.org/wiki/Fast_Fourier_transform).
  * @category Component
  */
 export class FFT extends MeterBase<FFTOptions> {

Tone/effect/Chorus.ts

@@ -17,15 +17,15 @@ export interface ChorusOptions extends StereoFeedbackEffectOptions {
 
 /**
  * Chorus is a stereo chorus effect composed of a left and right delay with an [[LFO]] applied to the delayTime of each channel.
- * When [[feedback]] is set to a value larger than 0, you also get Flanger-type effects. 
+ * When [[feedback]] is set to a value larger than 0, you also get Flanger-type effects.
  * Inspiration from [Tuna.js](https://github.com/Dinahmoe/tuna/blob/master/tuna.js).
- * Read more on the chorus effect on [SoundOnSound](http://www.soundonsound.com/sos/jun04/articles/synthsecrets.htm).
+ * Read more on the chorus effect on [Sound On Sound](http://www.soundonsound.com/sos/jun04/articles/synthsecrets.htm).
  *
  * @example
  * const chorus = new Tone.Chorus(4, 2.5, 0.5).toDestination().start();
  * const synth = new Tone.PolySynth().connect(chorus);
  * synth.triggerAttackRelease(["C3", "E3", "G3"], "8n");
- * 
+ *
  * @category Effect
  */
 export class Chorus extends StereoFeedbackEffect<ChorusOptions> {

Tone/effect/Distortion.ts

@@ -10,7 +10,7 @@ export interface DistortionOptions extends EffectOptions {
 /**
  * A simple distortion effect using Tone.WaveShaper.
  * Algorithm from [this stackoverflow answer](http://stackoverflow.com/a/22313408).
- *
+ * Read more about distortion on [Wikipedia] (https://en.wikipedia.org/wiki/Distortion_(music)).
  * @example
  * const dist = new Tone.Distortion(0.8).toDestination();
  * const fm = new Tone.FMSynth().connect(dist);