fix: code highlight error

[Sangresz]

Contributor checklist

• [ ] Bug fixes include regression tests
• [ ] Chores
• [X] Documentation changes
• [ ] Features include unit/acceptance tests
• [ ] Refactoring
• [ ] Update dependencies

I don't know if this is intentional but the latest version of the documentation of spark in the Dsl.Extensions page is displayed like this

I though that maybe it should be displayed like this instead

[zachdaniel]

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