Fixes typo on ACL Doctrine cache.

src/Symfony/Bundle/SecurityBundle/Resources/config/security_acl_dbal.xml

@@ -27,7 +27,7 @@
         <service id="security.acl.provider" alias="security.acl.dbal.provider" />
 
         <service id="security.acl.cache.doctrine" class="%security.acl.cache.doctrine.class%" public="false">
-            <argument type="service" id="security.acl.cache.doctrine_cache_impl" />
+            <argument type="service" id="security.acl.cache.doctrine.cache_impl" />
             <argument type="service" id="security.acl.permission_granting_strategy" />
         </service>