fix: showing incorrect filename in example

change filename to app/dashboard/@analytics/layout.js which what written incorrect i.e. app/layout.js

docs/02-app/01-building-your-application/01-routing/10-parallel-routes.mdx

@@ -199,7 +199,7 @@ export default function Layout({ children }: { children: React.ReactNode }) {
 }
 ```
 
-```jsx filename="app/layout.js" switcher
+```jsx filename="app/dashboard/@analytics/layout.js" switcher
 import Link from 'next/link'
 
 export default function Layout({ children }: { children: React.ReactNode }) {