minor #14826 [Mailer] Add missing transports entry in XML and PHP configurations (sebpacz)

This PR was merged into the 4.4 branch.

Discussion
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[Mailer] Add missing transports entry in XML and PHP configurations

The YAML configuration of the Messenger component contains the transports entry that is not defined in the XML and PHP configurations.

Commits
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0636c9d [Mailer] Add missing transports entry in XML and PHP configurations

Author: javiereguiluz

mailer.rst

@@ -978,6 +978,7 @@ you have a transport called ``async``, you can route the message there:
 
             <framework:config>
                 <framework:messenger>
+                    <framework:transport name="async">%env(MESSENGER_TRANSPORT_DSN)%</framework:transport>
                     <framework:routing message-class="Symfony\Component\Mailer\Messenger\SendEmailMessage">
                         <framework:sender service="async"/>
                     </framework:routing>
@@ -990,6 +991,9 @@ you have a transport called ``async``, you can route the message there:
         // config/packages/messenger.php
         $container->loadFromExtension('framework', [
             'messenger' => [
+                'transports' => [
+                    'async' => '%env(MESSENGER_TRANSPORT_DSN)%',
+                ],
                 'routing' => [
                     'Symfony\Component\Mailer\Messenger\SendEmailMessage' => 'async',
                 ],