Bump myst-parser from 2.0.0 to 3.0.1 in /docs (#4341)

Bumps [myst-parser](https://github.com/executablebooks/MyST-Parser) from 2.0.0 to 3.0.1.
- [Release notes](https://github.com/executablebooks/MyST-Parser/releases)
- [Changelog](https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/executablebooks/MyST-Parser/compare/v2.0.0...v3.0.1

)

---
updated-dependencies:
- dependency-name: myst-parser
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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