[docs] fix typo in example code (#4807)

Author: stardisblue

documentation/docs/03-layouts.md

@@ -194,7 +194,7 @@ src/routes/
 ```
 
 ```svelte
-/// file: src/routes/marx-brothers/[...path.svelte]
+/// file: src/routes/marx-brothers/[...path].svelte
 <script context="module">
 	/** @type {import('./[...path]').Load} */
 	export function load({ params }) {