Fix XML syntax

Author: javiereguiluz

routing.rst

@@ -1641,14 +1641,15 @@ defined in the class annotation.
                 xsi:schemaLocation="http://symfony.com/schema/routing
                     https://symfony.com/schema/routing/routing-1.0.xsd">
 
-            <import resource="../../src/Controller/"
-                type="annotation"
-                prefix="/blog"
-                name-prefix="blog_"
-                trailing-slash-on-root="false"
-                exclude="../../src/Controller/{DebugEmailController}.php">
-                <!-- ... -->
-            </import>
+                <import resource="../../src/Controller/"
+                    type="annotation"
+                    prefix="/blog"
+                    name-prefix="blog_"
+                    trailing-slash-on-root="false"
+                    exclude="../../src/Controller/{DebugEmailController}.php">
+                    <!-- ... -->
+                </import>
+            </routes>
 
         .. code-block:: php