Fix Vitest Typescript documentation (closes #649)

[keeganwitt]

Fixing the documentation for getting matchers to work with Vitest and Typescript.

Uses @cdierkens code from this comment.

[changeset-bot]

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Latest commit: c273b90

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (1f88101) 100.00% compared to head (c273b90) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #662   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           73        73           
  Lines          674       674           
  Branches       290       290           
=========================================
  Hits           674       674           

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