docs(router): update component structure in routing guide (#4355)

Co-authored-by: Sean Cassiere <33615041+SeanCassiere@users.noreply.github.com>

Author: Dovakeidy

docs/router/framework/react/routing/routing-concepts.md

@@ -190,7 +190,7 @@ The following table shows which component(s) will be rendered based on the URL:
 
 | URL Path         | Component                |
 | ---------------- | ------------------------ |
-| `/`              | `<Index>`                |
+| `/app`           | `<AppLayout>`            |
 | `/app/dashboard` | `<AppLayout><Dashboard>` |
 | `/app/settings`  | `<AppLayout><Settings>`  |