[10.x] Docs for route:list -vv (#9077)

* Add docs for expandable middleware group via `php artisan route:list -vv` (laravel/framework#48703)

* Improve wording

* Formatting

* Wording

* Update routing.md

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: NickSdot

routing.md

@@ -137,10 +137,13 @@ The `route:list` Artisan command can easily provide an overview of all of the ro
 php artisan route:list
 ```
 
-By default, the route middleware that are assigned to each route will not be displayed in the `route:list` output; however, you can instruct Laravel to display the route middleware by adding the `-v` option to the command:
+By default, the route middleware that are assigned to each route will not be displayed in the `route:list` output; however, you can instruct Laravel to display the route middleware and middleware group names by adding the `-v` option to the command:
 
 ```shell
 php artisan route:list -v
+
+# Expand middleware groups...
+php artisan route:list -vv
 ```
 
 You may also instruct Laravel to only show routes that begin with a given URI: