Update import statement to align with latest version of Django

django.conf.urls is deprecated in Django 4.0.x

docs/installation.rst

@@ -48,7 +48,7 @@ following to your project ``urls.py`` file:
 .. code-block:: python
 
     import django
-    from django.conf.urls import url
+    from django.urls import re_path as url
     from django.views.i18n import JavaScriptCatalog
 
     # Your normal URLs here...