docs: fix link to `docs/fiddle/quick-start` (#29350)

Co-authored-by: Erick Zhao <[email protected]>

docs/tutorial/quick-start.md

@@ -440,7 +440,7 @@ window.addEventListener('DOMContentLoaded', () => {
 </html>
 ```
 
-```fiddle docs/fiddles/quickstart
+```fiddle docs/fiddles/quick-start
 ```
 
 To summarize all the steps we've done: