minor #853 [Docs] Inject factories (autowiring) (loic425)

This PR was merged into the 1.11 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Bug fix?        | no
| New feature?    | yes (on docs)
| BC breaks?      | no
| Deprecations?   | no
| Related tickets | 
| License         | MIT


Commits
-------

4a3032f [Docs] Inject factories

Author: lchrusciel

docs/resource_factories.md

@@ -3,12 +3,14 @@
 Resource factories are used on Create operations to instantiate your resource.
 
 <!-- TOC -->
-* [Default factory for you resource](#default-factory-for-your-resource)
-* [Define your custom factory](#define-your-custom-factory)
-* [Use your custom method](#use-your-custom-method)
-* [Pass arguments to your method](#pass-arguments-to-your-method)
-* [Use a factory without declaring it](#use-a-factory-without-declaring-it)
-* [Use a callable for your custom factory](#use-a-callable-for-your-custom-factory)
+* [Resource factories](#resource-factories)
+  * [Default factory for your resource](#default-factory-for-your-resource)
+  * [Inject the factory in your service](#inject-the-factory-in-your-service)
+  * [Define your custom factory](#define-your-custom-factory)
+  * [Use your custom method](#use-your-custom-method)
+  * [Pass arguments to your method](#pass-arguments-to-your-method)
+  * [Use a factory without declaring it](#use-a-factory-without-declaring-it-)
+  * [Use a callable for your custom factory](#use-a-callable-for-your-custom-factory)
 <!-- TOC -->
 
 
@@ -18,6 +20,31 @@ By default, a resource factory is defined to your resource `Sylius\Component\Res
 
 It has a `createNew` method with no arguments.
 
+## Inject the factory in your service
+
+If you are using Symfony autowiring, you can inject the resource factory using the right variable name.
+
+```php
+namespace App;
+
+use Sylius\Resource\Factory\FactoryInterface;
+
+final class MyService
+{
+    public function __construct(
+        private FactoryInterface $bookFactory,
+    ) {}
+}
+```
+
+In this example, the `app.factory.book` will be injected in your `$bookFactory`
+
+You can find the variable name using this debug command:
+
+```shell
+$ bin/console debug:autowiring app.factory.book
+```
+
 ## Define your custom factory
 
 ```php