minor #17889 [DependencyInjection] Fix example for Autowire attribute (W0rma)

This PR was merged into the 6.2 branch.

Discussion
----------

[DependencyInjection] Fix example for Autowire attribute

I just noticed that the container will internally resolve the service name to "AppMailMailerConfiguration" if backslashes are not double-escaped.

Commits
-------

7cac7e2 Double-escape backslashes

Author: OskarStark

service_container/autowiring.rst

@@ -629,7 +629,7 @@ and even :doc:`complex expressions </service_container/expression_language>`::
             bool $debugMode,
 
             // and expressions
-            #[Autowire(expression: 'service("App\\Mail\\MailerConfiguration").getMailerMethod()')]
+            #[Autowire(expression: 'service("App\\\Mail\\\MailerConfiguration").getMailerMethod()')]
             string $mailerMethod
         ) {
         }