docs: fix typo fontEmbedCss -> fontEmbedCSS

[leadream]

Description

Change fontEmbedCss to fontEmbedCSS in the doc because the option name is fontEmbedCSS.

[vivcat]

👋 @leadream

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b751cbf) 62.93% compared to head (2833c87) 62.93%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #441   +/-   ##
=======================================
  Coverage   62.93%   62.93%           
=======================================
  Files          10       10           
  Lines         580      580           
  Branches      143      143           
=======================================
  Hits          365      365           
  Misses        151      151           
  Partials       64       64           

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