Add example of the output of rails routes --expanded in the routing…

… guide [ci skip]

- Instead of the note at the end, added an example of how the output
  looks by using the expanded switch.

guides/source/routing.md

@@ -1190,6 +1190,33 @@ For example, here's a small section of the `rails routes` output for a RESTful r
 edit_user GET    /users/:id/edit(.:format) users#edit
 ```
 
+You can also use the `--expanded` option to turn on the expanded table formatting mode.
+
+```
+$ rails routes --expanded
+
+--[ Route 1 ]-----------------------------------------------------------------
+Prefix            | users
+Verb              | GET
+URI               | /users(.:format)
+Controller#Action | users#index
+--[ Route 2 ]-----------------------------------------------------------------
+Prefix            |
+Verb              | POST
+URI               | /users(.:format)
+Controller#Action | users#create
+--[ Route 3 ]-----------------------------------------------------------------
+Prefix            | new_user
+Verb              | GET
+URI               | /users/new(.:format)
+Controller#Action | users#new
+--[ Route 4 ]-----------------------------------------------------------------
+Prefix            | edit_user
+Verb              | GET
+URI               | /users/:id/edit(.:format)
+Controller#Action | users#edit
+```
+
 You can search through your routes with the grep option: -g. This outputs any routes that partially match the URL helper method name, the HTTP verb, or the URL path.
 
 ```
@@ -1207,7 +1234,7 @@ $ rails routes -c Comments
 $ rails routes -c Articles::CommentsController
 ```
 
-TIP: You'll find that the output from `rails routes` is much more readable if you widen your terminal window until the output lines don't wrap. You can also use --expanded option to turn on the expanded table formatting mode.
+TIP: You'll find that the output from `rails routes` is much more readable if you widen your terminal window until the output lines don't wrap.
 
 ### Testing Routes