fix(core): accessibility improvements on document lists

[ninaandal]

Description

Items in document lists were marked up as div elements, but semantically, they are lists. The list items are now li, while the wrapper is a ul.

What to review

Make sure that document lists work as intended and that semantically, they are correct.

Notes for release

Improves accessibility for document lists

[vercel]

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Name	Status	Preview	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview	Sep 29, 2023 9:54am
test-studio	✅ Ready (Inspect)	Visit Preview	Sep 29, 2023 9:54am

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)		Sep 29, 2023 9:54am

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Sep 29, 2023 10:00 AM (UTC)

File	Status	Duration	Passed	Skipped	Failed
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	7s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	10s	3	0	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	9s	6	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	13s	9	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	47s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	11s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	6s	3	0	0

[bjoerge]

Thanks @ninaandal!