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Merge branch '6.1' into 6.2

* 6.1: Add event subscriber example to mailer documentation amqp no autocreate queues, see#16689

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Original file line number	Diff line number	Diff line change
`@@ -1404,6 +1404,39 @@ Here's an example of making one available to download::`
`1404`	`1404`	As it's possible for:class:`Symfony\\Component\\Mime\\DraftEmail`'s to be created
`1405`	`1405`	`without a To/From they cannot be sent with the mailer.`
`1406`	`1406`
	`1407`	`+Mailer Events`
	`1408`	`+-------------`
	`1409`	`+`
	`1410`	`+MessageEvent`
	`1411`	`+~~~~~~~~~~~~`
	`1412`	`+`
	`1413`	+``MessageEvent`` allows to change the Message and the Envelope before the email
	`1414`	`+is sent::`
	`1415`	`+`
	`1416`	`+ use Symfony\Component\EventDispatcher\EventSubscriberInterface;`
	`1417`	`+ use Symfony\Component\Mailer\Event\MessageEvent;`
	`1418`	`+ use Symfony\Component\Mime\Email;`
	`1419`	`+`
	`1420`	`+ class MailerSubscriber implements EventSubscriberInterface`
	`1421`	`+ {`
	`1422`	`+ public static function getSubscribedEvents()`
	`1423`	`+ {`
	`1424`	`+ return [`
	`1425`	`+ MessageEvent::class => 'onMessage',`
	`1426`	`+ ];`
	`1427`	`+ }`
	`1428`	`+`
	`1429`	`+ public function onMessage(MessageEvent $event): void`
	`1430`	`+ {`
	`1431`	`+ $message = $event->getMessage();`
	`1432`	`+ if (!$message instanceof Email) {`
	`1433`	`+ return;`
	`1434`	`+ }`
	`1435`	`+`
	`1436`	`+ // do something with the message`
	`1437`	`+ }`
	`1438`	`+ }`
	`1439`	`+`
`1407`	`1440`	`Development & Debugging`
`1408`	`1441`	`-----------------------`
`1409`	`1442`

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