Update providers index page

docs/providers/custom.rst

@@ -1,3 +1,5 @@
+.. _create-provider:
+
 Creating a custom providers
 ===========================
 

docs/providers/index.rst

@@ -7,7 +7,8 @@ Providers help to assemble the objects. They create objects and inject the depen
 
 Each provider is a callable. You call the provider like a function when you need to create an
 object. Provider retrieves the underlying dependencies and inject them into the created object.
-It causes the cascade effect that helps to assemble object graphs.
+It causes the cascade effect that helps to assemble object graphs. See ``Factory``, ``Singleton``,
+``Callable`` and other provider docs below.
 
 .. code-block:: bash
 
@@ -23,10 +24,13 @@ It causes the cascade effect that helps to assemble object graphs.
         │
         └──> provider6()
 
-Another providers feature is an overriding. Any of the providers can be overridden by another
-provider. When provider is overridden it calls to the overriding provider instead of providing
-the object by its own. This helps in testing. This also helps in overriding API clients with
-stubs for the development or staging environment. See the example at :ref:`provider-overriding`.
+Another providers feature is an overriding. You can override any provider by another provider.
+This helps in testing. This also helps in overriding API clients with stubs for the development
+or staging environment. See the example at :ref:`provider-overriding`.
+
+If you need to inject not the whole object but the parts see :ref:`provided-instance`.
+
+To create a new provider see :ref:`create-provider`.
 
 Providers module API docs - :py:mod:`dependency_injector.providers`
 

docs/providers/provided_instance.rst

@@ -1,3 +1,5 @@
+.. _provided-instance:
+
 Injecting provided object attributes, items, or call its methods
 ================================================================