docs: fix title for the code block

[sacrosanctic]

Not sure this is the right change but the file name doesn't look right without it.

Before:

After:

---

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Latest commit: 15747ee

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[Rich-Harris]

preview: https://svelte-dev-git-preview-kit-12991-svelte.vercel.app/

this is an automated message

[eltigerchino]

Thank you!