docs: fix examples which return string/number

[matthewmayer]

Partial manual fix for #3335 for clarifying the return type of examples

• unquoted strings
• incorrectly quoted numbers
• doubled up examples

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (e6d27a3) to head (50c21e0).
Report is 4 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3348   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files        2811     2811           
  Lines      217017   217017           
  Branches      941      939    -2     
=======================================
  Hits       216966   216966           
  Misses         51       51           

Files with missing lines	Coverage Δ
src/modules/color/index.ts	100.00% <ø> (ø)
src/modules/commerce/index.ts	97.71% <ø> (ø)
src/modules/date/index.ts	100.00% <ø> (ø)
src/modules/finance/index.ts	100.00% <ø> (ø)
src/modules/internet/index.ts	100.00% <ø> (ø)

[ST-DDT]

I'll merge this early so that it doesn't conflict with the example formatting PR and so I have the latest improvements available.