docs: Update sveltekit.mdx (#1844)

SvelteKit no longer re-exports vitePreprocess. You should import it directly from @sveltejs/vite-plugin-svelte.

docs/guides/getting-started/setup/sveltekit.mdx

@@ -107,7 +107,7 @@ Then update the `adapter` import in the `svelte.config.js` file:
 ```javascript title=svelte.config.js
 // highlight-next-line
 import adapter from '@sveltejs/adapter-static' // This was changed from adapter-auto
-import { vitePreprocess } from '@sveltejs/kit/vite'
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte'
 
 /** @type {import('@sveltejs/kit').Config} */
 const config = {