Remove SwiftMailer contents

Author: javiereguiluz

bundles.rst

@@ -28,7 +28,6 @@ file::
         Symfony\Bundle\SecurityBundle\SecurityBundle::class => ['all' => true],
         Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
         Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true],
-        Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle::class => ['all' => true],
         Doctrine\Bundle\DoctrineBundle\DoctrineBundle::class => ['all' => true],
         Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle::class => ['all' => true],
         // this bundle is enabled only in 'dev' and 'test', so you can't use it in 'prod'