docs: Import .svelte.js files with explicit extension. (#14584)

Author: brunnerh

documentation/docs/06-runtime/01-stores.md

@@ -49,7 +49,7 @@ export const userState = $state({
 ```svelte
 <!--- file: App.svelte --->
 <script>
-	import { userState } from './state.svelte';
+	import { userState } from './state.svelte.js';
 </script>
 
 <p>User name: {userState.name}</p>

documentation/docs/06-runtime/02-context.md

@@ -22,7 +22,7 @@ export const myGlobalState = $state({
 ```svelte
 <!--- file: App.svelte --->
 <script>
-	import { myGlobalState } from './state.svelte';
+	import { myGlobalState } from './state.svelte.js';
 	// ...
 </script>
 ```