Chore: Fix typo in migrating-to-8.0.0.md

[stephenwade]

s/Three new rules/Four new rules/

[eslint-github-bot[bot]]

Hi @stephenwade!, thanks for the Pull Request

The first commit message isn't properly formatted. We ask that you update the message to match this format, as we use it to generate changelogs and automate releases.

• The commit message tag must be one of the following:

  The Tag is one of the following:

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  • Build - changes to build process only.
  • Upgrade - for a dependency upgrade.
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[linux-foundation-easycla[bot]]

The committers are authorized under a signed CLA.

• :white_check_mark: Stephen Wade (7dd1c4e289da1cd1e7b75004f6b125e0049ae8d8)

[netlify[bot]]

✔️ Deploy Preview for eslint ready!

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😎 Browse the preview: https://deploy-preview-866--eslint.netlify.app/docs/8.0.0/user-guide/migrating-to-8.0.0

[nzakas]

Thanks. This will only fix the guide on the live website, can you also submit a pull request for: https://github.com/eslint/eslint/edit/master/docs/user-guide/migrating-to-8.0.0.md

[snitin315]

https://github.com/eslint/eslint/pull/14985