fixed lint

Author: Crovitche-1623

reference/configuration/doctrine.rst

@@ -187,6 +187,7 @@ If you want to disable the `Autocommit`_ mode, you need to update your DBAL conf
                     auto_commit: false
 
     .. code-block:: xml
+
         <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xmlns:doctrine="http://symfony.com/schema/dic/doctrine"