Ticket #20997: update_contrib_sessions_docs.v1.diff

docs/topics/http/sessions.txt

@@ -454 +454 @@
 Using sessions out of views
 ===========================
 
+.. note::
+
+    The examples in this section import the ``SessionStore`` object directly from
+    the ``django.contrib.sessions.backends.db`` backend. In your own code, you
+    should consider importing ``SessionStore`` from the session engine designated
+    by :setting:`SESSION_ENGINE`, as below:
+
+      >>> from importlib import import_module
+      >>> from django.conf import settings
+      >>> SessionStore = import_module(settings.SESSION_ENGINE).SessionStore
+
 An API is available to manipulate session data outside of a view::
 
     >>> from django.contrib.sessions.backends.db import SessionStore