Docs: Explain about context=module exports into Typescript

[curiousdannii]

Document the issue from #5817

This is just a suggestion to get the ball rolling. Please feel free to refine my text as much as needed.

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[dummdidumm]

Thank you! We're currently in the process of adjusting the docs for Svelte 5, and I'll make a note to include something along those lines in the updated documentation