small doc enhancements for chorus, distortion, and FFT

[quargsgreene]

1. Please make all pull requests on the dev branch.
2. Don't commit build files
3. Try to get all tests to pass.

[codecov[bot]]

Codecov Report

Merging #1133 (34f4c14) into dev (d463286) will increase coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #1133      +/-   ##
==========================================
+ Coverage   98.40%   98.42%   +0.02%     
==========================================
  Files         184      184              
  Lines        7709     7724      +15     
  Branches      679      680       +1     
==========================================
+ Hits         7586     7602      +16     
  Misses         35       35              
+ Partials       88       87       -1     

Impacted Files	Coverage Δ
Tone/component/analysis/FFT.ts	100.00% <ø> (ø)
Tone/effect/Chorus.ts	100.00% <ø> (ø)
Tone/effect/Distortion.ts	100.00% <ø> (ø)
Tone/component/analysis/Meter.ts	100.00% <0.00%> (ø)
Tone/core/clock/Transport.ts	98.47% <0.00%> (+0.10%)	:arrow_up:
Tone/core/context/Context.ts	97.33% <0.00%> (+0.73%)	:arrow_up:

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[tambien]

Thank you!