fix: update anchor link to doc

[FanchGadjo]

Summary

Anchor link to doc is broken, due to removed hypen in actual doc :

    You might want to include a file extension in your import, or update your 'moduleFileExtensions', which is currently ['js', 'json', 'jsx', 'ts', 'tsx', 'node'].

    See https://jestjs.io/docs/en/configuration#modulefileextensions-array-string

Working link : https://jestjs.io/docs/en/configuration#modulefileextensions-arraystring

Test plan

Unable to test. Stumbled on this issue :
nodkz/mongodb-memory-server#131

[codecov-io]

Codecov Report

Merging #9616 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9616   +/-   ##
=======================================
  Coverage   65.09%   65.09%           
=======================================
  Files         287      287           
  Lines       12145    12145           
  Branches     3007     3007           
=======================================
  Hits         7906     7906           
  Misses       3604     3604           
  Partials      635      635

Impacted Files	Coverage Δ
packages/jest-runtime/src/helpers.ts	88.23% <ø> (ø)	⬆️

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[jeysal]

Thanks!

[github-actions]

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