[DependencyInjection] Clarify the #[Target] attribute 2

Author: HypeMC

service_container/autowiring.rst

@@ -556,6 +556,21 @@ decorrelated of any implementation name (like shown in the example above).
     The ``#[Target]`` attribute only accepts the name of the argument used in the named
     alias, it **does not** accept service ids or service aliases.
 
+You can get a list of named autowirable alias by running the ``debug:autowiring`` command::
+
+.. code-block:: terminal
+
+    $ bin/console debug:autowiring TransformerInterface
+
+    Autowirable Types
+    =================
+
+     The following classes & interfaces can be used as type-hints when autowiring:
+     (only showing classes/interfaces matching TransformerInterface)
+
+     App\Util\TransformerInterface - alias:App\Util\Rot13Transformer
+     App\Util\TransformerInterface $shoutyTransformer - alias:App\Util\UppercaseTransformer
+
 Suppose you want to inject the ``App\Util\UppercaseTransformer`` service. You would use
 the ``#[Target]`` attribute by passing the name of the ``$shoutyTransformer`` argument::