Fix testMatch config in docs

[gengjiawen]

Summary

Single quoted strings are not allowed in JSON

Test plan

[codecov-io]

Codecov Report

Merging #6023 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #6023   +/-   ##
======================================
  Coverage    64.3%   64.3%           
======================================
  Files         217     217           
  Lines        8317    8317           
  Branches        4       3    -1     
======================================
  Hits         5348    5348           
  Misses       2968    2968           
  Partials        1       1

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[rickhanlonii]

Thanks!

[github-actions]

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