Replace Aura router by FastRoute in docs

doc/book/container/factories.md

@@ -16,7 +16,7 @@ namespace, and define an `__invoke()` method that accepts an
 - **Requires**: no additional services are required.
 - **Optional**:
     - `Zend\Expressive\Router\RouterInterface`. When provided, the service will
-      be used to construct the `Application` instance; otherwise, an Aura router
+      be used to construct the `Application` instance; otherwise, an FastRoute router
       implementation will be used.
     - `Zend\Expressive\FinalHandler`. This is a meta-service, as the only concrete
       type required is a callable that can be used as a final middleware in the

doc/book/quick-start.md

@@ -19,7 +19,7 @@ If you haven't already, [install Composer](https://getcomposer.org). Once you
 have, we can install Expressive, along with a router and a container:
 
 ```bash
-$ composer require zendframework/zend-expressive aura/router zendframework/zend-servicemanager
+$ composer require zendframework/zend-expressive zendframework/zend-expressive-fastroute zendframework/zend-servicemanager
 ```
 
 > ### Routers