Update outofthebox.rst

Updated outdated installation instructions

docs/source/topics/outofthebox.rst

@@ -6,27 +6,16 @@ To use the oscarapi application in an oscar ecommerce site without overriding or
 
 1. Install it (see :ref:`django-oscar-api-installation`)
 2. Add ``rest_framework`` and ``oscarapi`` to your INSTALLED_APPS section in ``settings.py``
-3. Add the application's urls to your own app's `url.py`::
+3. Add the application's urls to your urlconf
 
-    from django.conf.urls import url
+   .. code-block:: python
 
-    from oscarapi.app import application as api
+      from django.urls import include
 
-    urlpatterns = (
-        # all the things you already have
-        url(r'^oscarapi/', api.urls),
-    )
-
-   or with the newer Django 2.x way::
-
-    from django.urls import path
-
-    from oscarapi.app import application as api
-
-    urlpatterns = (
-        # all the things you already have
-        path('oscarapi/', api.urls),
-    )
+      urlpatterns = (
+          # all the things you already have
+          path("api/", include("oscarapi.urls")),
+      )
 
 4. Apply migrations::