Fixing typos

Author: Pash10g

docs/40-structure-site/4-beckend-2.mdx

@@ -9,7 +9,7 @@ When linking to other pages, you should always use relative links. This ensures
 This page is a child of the `rentals` page, so the link should look like this:
 
 ```
-/rentals/<rental_id>
+/rental/<rental_id>
 ```
 First let look at the route in config/routes.yaml:
 ```yaml