Changed email message instantiation to a more 'symfonysh' way.

Author: alebo

cookbook/email/email.rst

@@ -103,7 +103,8 @@ an email is pretty straightforward::
 
     public function indexAction($name)
     {
-        $message = \Swift_Message::newInstance()
+        $mailer = $this->get('mailer');
+        $message = $mailer->createMessage()
             ->setSubject('Hello Email')
             ->setFrom('[email protected]')
             ->setTo('[email protected]')
@@ -114,7 +115,7 @@ an email is pretty straightforward::
                 )
             )
         ;
-        $this->get('mailer')->send($message);
+        $mailer->send($message);
 
         return $this->render(...);
     }