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/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);