[DoctrineBundle] Fix some typos

src/Symfony/Bundle/DoctrineBundle/DependencyInjection/Configuration.php

@@ -102,7 +102,7 @@ class Configuration
                 ->end()
                 ->fixXmlConfig('driver_class', 'driverClass')
                 ->children()
-                    ->scalarNode('driver_class')->end()
+                    ->scalarNode('driverClass')->end()
                 ->end()
                 ->fixXmlConfig('options', 'driverOptions')
                 ->children()
@@ -113,7 +113,7 @@ class Configuration
                 ->end()
                 ->fixXmlConfig('wrapper_class', 'wrapperClass')
                 ->children()
-                    ->scalarNode('wrapper_class')->end()
+                    ->scalarNode('wrapperClass')->end()
                 ->end()
             ->end()
         ;

src/Symfony/Bundle/TwigBundle/DependencyInjection/Configuration.php

@@ -25,7 +25,7 @@ class Configuration
         $rootNode
             ->children()
                 ->scalarNode('cache_warmer')->end()
-                ->end();
+            ->end();
         ;
 
         $this->addExtensionsSection($rootNode);