Fixing typos

[deining]

This PR fixes various typos I spotted in the project.

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[delucis]

Thanks for the fixes @deining! I double checked the syntax highlighting themes fix didn’t have any unwanted consequences, but looks safe to me.

Normally we add a changelog entry when modifying code in packages/, but given this should all have no end-user impact for the most part, I think we can go ahead and merge this without.