Fix a wrong doc redirection

Author: javiereguiluz

_build/redirection_map

@@ -507,7 +507,7 @@
 /frontend/encore/versus-assetic /frontend
 /components/http_client /http_client
 /components/mailer /mailer
-/messenger/message-recorder messenger/dispatch_after_current_bus
+/messenger/message-recorder /messenger/dispatch_after_current_bus
 /components/stopwatch https://github.com/symfony/stopwatch
 /service_container/3.3-di-changes https://symfony.com/doc/3.4/service_container/3.3-di-changes.html
 /testing/functional_tests_assertions /testing#testing-application-assertions