Fixed #27152 -- Supported comma delimiter in memcached LOCATION string.

docs/releases/1.11.txt

@@ -173,6 +173,10 @@ Cache
   control of client behavior. See the :ref:`cache arguments <cache_arguments>`
   documentation for examples.
 
+* Memcached backends now allow defining multiple servers as a comma-delimited
+  string in :setting:`LOCATION <CACHES-LOCATION>`, for convenience with
+  third-party services that use such strings in environment variables.
+
 CSRF
 ~~~~