docs(transparentize): fix trailing comma and semicolon in example code

[hideo54]

This is a really tiny fix 🙃 There's an incorrect use of trailing comma and semicolon in example code for transparentize, so I fixed it.

I edited only src/color/transparentize.js. The other changes under docs/ are generated automatically.

This is my first contribution to this repository. Feel free to let me know if you have any problem.

[codecov[bot]]

Codecov Report

Merging #604 (de2df9a) into parse-hsl-fix (bf2bd28) will not change coverage. The diff coverage is n/a.

@@               Coverage Diff               @@
##           parse-hsl-fix      #604   +/-   ##
===============================================
  Coverage         100.00%   100.00%           
===============================================
  Files                 89        89           
  Lines                856       856           
  Branches             319       319           
===============================================
  Hits                 856       856           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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Impacted Files	Coverage Δ
src/color/transparentize.js	100.00% <ø> (ø)

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