update ansible.cfg example (#41832)

examples/ansible.cfg

@@ -232,6 +232,13 @@
 # current IP information.
 #fact_caching = memory
 
+#This option tells Ansible where to cache facts. The value is plugin dependent.
+#For the jsonfile plugin, it should be a path to a local directory.
+#For the redis plugin, the value is a host:port:database triplet: fact_caching_connection = localhost:6379:0
+
+#fact_caching_connection=/tmp
+
+
 
 # retry files
 # When a playbook fails by default a .retry file will be created in ~/