doctrine.rst formatting

Author: timglabisch

reference/configuration/doctrine.rst

@@ -546,7 +546,6 @@ Keep in mind that the bundle you want to overwrite has to exist.
             ),
         ));
 
-
 You can also create new mappings. For example outside of the Symfony folder.
 
 .. configuration-block::
@@ -602,9 +601,8 @@ You can also create new mappings. For example outside of the Symfony folder.
             ),
         ));
 
-
 Detecting a Mapping MetadataDriver
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 If the ``type`` on the bundle configuration isn't set,
 the DoctrineBundle will try to detect the correct metadata driver for
@@ -621,7 +619,7 @@ there is an ``Entity`` folder in the bundle's root directory.
 If the folder does not exist, Doctrine will fall back to using an annotation driver.
 
 The Configuration Directory
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The default configuration value depends on the used driver.
 For drivers that rely on the PHP files (annotation, staticphp) it will