chore: Fix typo in synthesizer README

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[codecov]

Codecov Report

Merging #726 (8916b34) into main (28226dd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #726   +/-   ##
=======================================
  Coverage   67.78%   67.78%           
=======================================
  Files          45       45           
  Lines        7375     7375           
  Branches     1398     1398           
=======================================
  Hits         4999     4999           
  Misses       2367     2367           
  Partials        9        9           

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