Update error_pages.rst

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

cookbook/controller/error_pages.rst

@@ -187,8 +187,10 @@ to point to it.
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:twig="http://symfony.com/schema/dic/twig"
-            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
-                http://symfony.com/schema/dic/twig http://symfony.com/schema/dic/twig/twig-1.0.xsd">
+            xsi:schemaLocation="http://symfony.com/schema/dic/services
+                http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/twig
+                http://symfony.com/schema/dic/twig/twig-1.0.xsd">
 
             <twig:config>
                 <twig:exception-controller>AppBundle:Exception:showException</twig:exception-controller>