Update providers index page

docs/providers/index.rst

@@ -3,18 +3,32 @@
 Providers
 =========
 
-Providers help you to define how objects are created. They manage objects lifetime and their
+Providers help to assemble the objects. They create objects and inject the dependencies.
-dependencies.
 
 Each provider is a callable. You call the provider like a function when you need to create an
-object or call a function. Provider calls all dependent providers to retrieve the dependencies
+object. Provider retrieves the underlying dependencies and inject them into the created object.
-and injects them.
+It causes the cascade effect that helps to assemble object graphs.
 
-Any of the providers can be overridden by another provider. When provider is overridden it calls
+.. code-block:: bash
-to the overriding provider. This helps in testing or overriding API clients with stubs for dev or
-stage environment.
 
-Providers package API docs - :py:mod:`dependency_injector.providers`
+   provider1()
+   │
+   ├──> provider2()
+   │
+   ├──> provider3()
+   │    │
+   │    └──> provider4()
+   │
+   └──> provider5()
+        │
+        └──> 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.
+
+Providers module API docs - :py:mod:`dependency_injector.providers`
 
 ..  toctree::
     :maxdepth: 2