Fixed an RST syntax issue

Author: javiereguiluz

configuration.rst

@@ -341,13 +341,13 @@ you can define a ``staging`` environment where the client can test the project
 before going to production:
 
 #. Create a configuration directory with the same name as the environment (in
-  this case, ``config/packages/staging/``);
+   this case, ``config/packages/staging/``);
 #. Add the needed configuration files in ``config/packages/staging/`` to
-  define the behavior of the new environment. Symfony loads first the files in
-  ``config/packages/*.yaml``, so you must only configure the differences with
-  those files;
+   define the behavior of the new environment. Symfony loads first the files in
+   ``config/packages/*.yaml``, so you must only configure the differences with
+   those files;
 #. Select the ``staging`` environment using the ``APP_ENV`` env var as explained
-  in the previous section.
+   in the previous section.
 
 .. _config-env-vars: