docs: use "msw" for API mocking in examples

[kettanaito]

What:

Uses msw library for API mocking in the test suite example in README.

Why:

These changes are implemented similar to the React Example from the Testing Library documentation.

How:

• Initial request handler via setupServer
• Per-test setup handler via server.use(), allowing to test an error scenario

Checklist:

• Documentation added to the
  docs site
• Tests (not applicable)
• Typescript definitions updated (not applicable)
• Ready to be merged
  

• Follow up to Consider showcasing "msw" package for API mocking testing-library-docs#482

[kettanaito]

I've also split the two code blocks, assuming there's been a typo and they were merged together by mistake (they showcase two different files). Please let me know if that was intentional, I'll revert the change. Thanks!

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[codecov]

Codecov Report

Merging #697 into master will not change coverage.
The diff coverage is n/a.

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##            master      #697   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          100       100           
  Branches        16        16           
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  Hits           100       100           

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[kentcdodds]

Awesome 👍

[kentcdodds]

@all-contributors please add @kettanaito for docs

[allcontributors]

@kentcdodds

I've put up a pull request to add @kettanaito! 🎉

[kentcdodds]

🎉 This PR is included in version 10.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[kettanaito]

@kentcdodds, thanks for the review! Honored to be a part of this!