Update symfony mailer docblocks (#38773)

* Update docblocks from Swift Mailer to Symfony Mailer

* Make TransportInterface more specific

Author: Jubeki

src/Illuminate/Mail/MailManager.php

@@ -219,10 +219,10 @@ protected function createSendmailTransport(array $config)
     }
 
     /**
-     * Create an instance of the Amazon SES Swift Transport driver.
+     * Create an instance of the Symfony Amazon SES Transport driver.
      *
      * @param  array  $config
-     * @return \Illuminate\Mail\Transport\SesTransport
+     * @return \Symfony\Component\Mailer\Bridge\Amazon\Transport\SesApiAsyncAwsTransport
      */
     protected function createSesTransport(array $config)
     {
@@ -257,10 +257,10 @@ protected function createMailTransport()
     }
 
     /**
-     * Create an instance of the Mailgun Swift Transport driver.
+     * Create an instance of the Symfony Mailgun Transport driver.
      *
      * @param  array  $config
-     * @return \Symfony\Component\Mailer\Transport\TransportInterface
+     * @return \Symfony\Component\Mailer\Bridge\Mailgun\Transport\MailgunApiTransport
      */
     protected function createMailgunTransport(array $config)
     {
@@ -279,10 +279,10 @@ protected function createMailgunTransport(array $config)
     }
 
     /**
-     * Create an instance of the Postmark Swift Transport driver.
+     * Create an instance of the Symfony Postmark Transport driver.
      *
      * @param  array  $config
-     * @return \Swift_Transport
+     * @return \Symfony\Component\Mailer\Bridge\Postmark\Transport\PostmarkApiTransport
      */
     protected function createPostmarkTransport(array $config)
     {