Add container usage for list provider example

docs/providers/list.rst

@@ -13,7 +13,7 @@ List provider
 .. literalinclude:: ../../examples/providers/list.py
    :language: python
    :lines: 3-
-   :emphasize-lines: 19-22
+   :emphasize-lines: 21-24
 
 ``List`` provider handles positional arguments the same way as a :ref:`factory-provider`.
 

examples/providers/list.py

@@ -3,7 +3,7 @@
 import dataclasses
 from typing import List
 
-from dependency_injector import providers
+from dependency_injector import containers, providers
 
 
 @dataclasses.dataclass
@@ -16,23 +16,27 @@ class Dispatcher:
     modules: List[Module]
 
 
-dispatcher_factory = providers.Factory(
-    Dispatcher,
-    modules=providers.List(
-        providers.Factory(Module, name='m1'),
-        providers.Factory(Module, name='m2'),
-    ),
-)
+class Container(containers.DeclarativeContainer):
+
+    dispatcher_factory = providers.Factory(
+        Dispatcher,
+        modules=providers.List(
+            providers.Factory(Module, name='m1'),
+            providers.Factory(Module, name='m2'),
+        ),
+    )
 
 
 if __name__ == '__main__':
-    dispatcher = dispatcher_factory()
+    container = Container()
+
+    dispatcher = container.dispatcher_factory()
 
     assert isinstance(dispatcher.modules, list)
     assert dispatcher.modules[0].name == 'm1'
     assert dispatcher.modules[1].name == 'm2'
 
-    # Call "dispatcher = dispatcher_factory()" is an equivalent for:
+    # Call "dispatcher = container.dispatcher_factory()" is equivalent to:
     # dispatcher = Dispatcher(
     #     modules=[
     #         Module(name='m1'),