docs: clarify how links with cascade deletion are deleted

[shahednasser]

Summary

What — What changes are introduced in this PR?

Update the section on delete cascades for links to mention that links must be deleted with link.delete.

Closes DX-2332

Why — Why are these changes relevant or necessary?

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How — How have these changes been implemented?

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Testing — How have these changes been tested, or how can the reviewer test the feature?

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Examples

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// Example usage

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Project	Deployment	Preview	Comments	Updated (UTC)
docs-v2	Ready	Preview	Comment	Nov 28, 2025 1:49pm

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Project	Deployment	Preview	Comments	Updated (UTC)
api-reference	Ignored			Nov 28, 2025 1:49pm
api-reference-v2	Ignored			Nov 28, 2025 1:49pm
cloud-docs	Ignored			Nov 28, 2025 1:49pm
docs-ui	Ignored			Nov 28, 2025 1:49pm
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user-guide	Ignored			Nov 28, 2025 1:49pm