Update mailer.rst

Co-authored-by: Wouter J <[email protected]>

Author: ThomasLandauer

mailer.rst

@@ -283,7 +283,7 @@ Catching Transport Exceptions
 -----------------------------
 
 If handing over the email to your transport fails, a
-:class:`Symfony\\Component\\Mailer\Exception\\TransportException` is thrown. To
+:class:`Symfony\\Component\\Mailer\\Exception\\TransportExceptionInterface` is thrown. To
 make sure that sending the email was successful, you can catch that exception::
 
     use Symfony\Component\Mailer\Exception\TransportExceptionInterface;