minor #17784 [DependencyInjection] [LazyServices] Add #[Autoconfigure] attribute mention (alexandre-daubois)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection] [LazyServices] Add `#[Autoconfigure]` attribute mention

While watching `@nicolas`-grekas' SymfonyCon talk about lazy objects to give a try to #16970, he told that the documentation about `#[Autoconfigure(lazy: ...)]` was missing. So here it is 😄

Commits
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b408ab8 [LazyServices] Add `#[Autoconfigure]` attribute mention

Author: javiereguiluz

service_container/lazy_services.rst

@@ -41,6 +41,8 @@ In order to use the lazy service instantiation, you will need to install the
 
     $ composer require symfony/proxy-manager-bridge
 
+.. _lazy-services_configuration:
+
 Configuration
 -------------
 
@@ -101,6 +103,26 @@ To check if your proxy works you can check the interface of the received object:
     over the ``lazy`` flag and directly instantiate the service as it would
     normally do.
 
+You can also configure your service's laziness thanks to the
+:class:`Symfony\\Component\\DependencyInjection\\Attribute\\Autoconfigure` attribute.
+The attribute has to be used like this::
+
+    namespace App\Twig;
+
+    use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+    use Twig\Extension\ExtensionInterface;
+
+    #[Autoconfigure(lazy: true)]
+    class AppExtension implements ExtensionInterface
+    {
+        // ...
+    }
+
+.. versionadded:: 5.4
+
+    The :class:`Symfony\\Component\\DependencyInjection\\Attribute\\Autoconfigure` attribute
+    was introduced in Symfony 5.4.
+
 Interface Proxifying
 --------------------
 
@@ -159,6 +181,27 @@ specific interfaces.
             ;
         };
 
+Just like in the :ref:`Configuration <lazy-services_configuration>` section, you can
+use the :class:`Symfony\\Component\\DependencyInjection\\Attribute\\Autoconfigure`
+attribute to configure the interface to proxify by passing its FQCN as the ``lazy``
+parameter value::
+
+    namespace App\Twig;
+
+    use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+    use Twig\Extension\ExtensionInterface;
+
+    #[Autoconfigure(lazy: ExtensionInterface::class)]
+    class AppExtension implements ExtensionInterface
+    {
+        // ...
+    }
+
+.. versionadded:: 5.4
+
+    The :class:`Symfony\\Component\\DependencyInjection\\Attribute\\Autoconfigure` attribute
+    was introduced in Symfony 5.4.
+
 The virtual `proxy`_ injected into other services will only implement the
 specified interfaces and will not extend the original service class, allowing to
 lazy load services using `final`_ classes. You can configure the proxy to