Fixed #27641 -- Doc'd default local-memory caching in deployment checklist.

docs/howto/deployment/checklist.txt

@@ -103,7 +103,8 @@ default server to return "444 No Response" on an unrecognized host:
 -----------------
 
 If you're using a cache, connection parameters may be different in development
-and in production.
+and in production. Django defaults to per-process :ref:`local-memory caching
+<local-memory-caching>` which may not be desirable.
 
 Cache servers often have weak authentication. Make sure they only accept
 connections from your application servers.

docs/topics/cache.txt

@@ -302,6 +302,8 @@ above example, if your server runs as the user ``apache``, make sure the
 directory ``/var/tmp/django_cache`` exists and is readable and writable by the
 user ``apache``.
 
+.. _local-memory-caching:
+
 Local-memory caching
 --------------------