minor #19794 Add ENV processor example (antoniovj1)

This PR was merged into the 6.4 branch.

Discussion
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Add ENV processor example

Added example of autowiring with env processor

Commits
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face906 Add ENV processor example

Author: OskarStark

service_container/autowiring.rst

@@ -614,7 +614,8 @@ logic about those arguments::
 
 The ``#[Autowire]`` attribute can also be used for :ref:`parameters <service-parameters>`,
 :doc:`complex expressions </service_container/expression_language>` and even
-:ref:`environment variables <config-env-vars>`::
+:ref:`environment variables <config-env-vars>` ,
+:doc:`including env variable processors </configuration/env_var_processors>`::
 
     // src/Service/MessageGenerator.php
     namespace App\Service;
@@ -640,6 +641,10 @@ The ``#[Autowire]`` attribute can also be used for :ref:`parameters <service-par
             // environment variables
             #[Autowire(env: 'SOME_ENV_VAR')]
             string $senderName,
+
+            // environment variables with processors
+            #[Autowire(env: 'bool:SOME_BOOL_ENV_VAR')]
+            string $allowAttachments,
         ) {
         }
         // ...