Fix typos

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Author: ifdattic

components/routing/introduction.rst

@@ -288,7 +288,7 @@ calls a closure and uses the result as a :class:`Symfony\\Component\\Routing\\Ro
 
     use Symfony\Component\Routing\Loader\ClosureLoader;
 
-    $closure = function() {
+    $closure = function () {
         return new RouteCollection();
     };
 
@@ -307,7 +307,7 @@ out here.
 The all-in-one Router
 ~~~~~~~~~~~~~~~~~~~~~
 
-The :class:`Symfony\\Component\\Routing\\Router` class is a all-in-one package
+The :class:`Symfony\\Component\\Routing\\Router` class is an all-in-one package
 to quickly use the Routing component. The constructor expects a loader instance,
 a path to the main route definition and some other settings::