docs: Update svelte 5 preview faqs to include lsp formatting

[dmmulroy]

Svelte 5 LSP formatter FAQ

This pr updates the FAQs section of the Svelte 5 preview site to include information on how to correctly configure the svelte language server for formatting.

[changeset-bot]

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Latest commit: 53d8033

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[Rich-Harris]

thanks! @dummdidumm does this all look right to you?

[dummdidumm]

Looks good 👍