docs: Unresolved reference in docs (#14231)

* fix: Unresolved reference in docs

* fix

Author: elliott-with-the-longest-name-on-github

documentation/docs/30-advanced/68-observability.md

@@ -43,9 +43,20 @@ SvelteKit provides access to the `root` span and the `current` span on the reque
 
 ```js
 /// file: $lib/authenticate.ts
+
+// @filename: ambient.d.ts
+declare module '$lib/auth-core' {
+	export function getAuthenticatedUser(): Promise<{ id: string }>
+}
+
+// @filename: index.js
+// ---cut---
+import { getRequestEvent } from '$app/server';
+import { getAuthenticatedUser } from '$lib/auth-core';
+
 async function authenticate() {
+	const user = await getAuthenticatedUser();
 	const event = getRequestEvent();
-	const user = await getAuthenticatedUser(event);
 	event.tracing.root.setAttribute('userId', user.id);
 }
 ```