Typst quarto_super captions should be wrapped in a block

[christopherkenny]

I believe this is just on the scale of a typo, so I haven't filled out the checklist, but just let me know if you disagree and I'll update.

Description

quarto_super emits figure captions as paragraphs (par(...)) because they are not placed in block(...) calls.

This is generally not a problem, since they're both text and will typically show fine. However, this becomes a niche issue when doing things like numbering paragraphs as in ctk-legal, as the captions get captured as paragraphs. (Example PDF with the updated quarto_super using a defintions.typ partial.)

See this discussion in the Typst forum, where this was pointed out.

Checklist

I have (if applicable):

• filed a contributor agreement.
• [N/A] referenced the GitHub issue this PR closes
• updated the appropriate changelog in the PR
• ensured the present test suite passes
• added new tests
• [N/A] created a separate documentation PR in Quarto's website repo and linked it to this PR

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[cscheid]

I think this is a good fix (but it's not just a typo, because it does affect downstream code potentially).

Could you add an entry to the changelog? Thanks.

[cscheid]

Perfect. Thank you!