Add Svelte documentation link to TypeScript guide

[Prajwalg19]

Description

Svelte typescript docs links was missing so i have added it for completeness.

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[astrobot-houston]

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Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[astrobot-houston]

Hello! Thank you for opening your first PR to Astro’s Docs! 🎉

Here’s what will happen next:

1. Our GitHub bots will run to check your changes.
   If they spot any broken links you will see some error messages on this PR.
   Don’t hesitate to ask any questions if you’re not sure what these mean!

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[sarah11918]

Amazing, thank you so much @Prajwalg19 ! We appreciate you taking the time to add this helpful link, and are happy to welcome you to Team Docs! 🥳