Add documentation hint about db_driver
Add documentation hint about db_driver

vyshkant/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,rmzamora/SonataMediaBundle,OskarStark/SonataMediaBundle,rmzamora/SonataMediaBundle,vyshkant/SonataMediaBundle,bgaleotti/SonataMediaBundle,bgaleotti/SonataMediaBundle,jerome-fix/SonataMediaBundle,bgaleotti/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,bgaleotti/SonataMediaBundle,OskarStark/SonataMediaBundle,jerome-fix/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,vyshkant/SonataMediaBundle,nicolasricci/SonataMediaBundle,OskarStark/SonataMediaBundle,OskarStark/SonataMediaBundle,nicolasricci/SonataMediaBundle,hug963/SonataMediaBundle,vyshkant/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,sonata-project/SonataMediaBundle,jerome-fix/SonataMediaBundle,jerome-fix/SonataMediaBundle,vyshkant/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,rmzamora/SonataMediaBundle,Soullivaneuh/SonataMediaBundle,hug963/SonataMediaBundle