Merge pull request #26141 from jimangel/remove-redis-and-master-slave-terminology-2

Remove Master/Slave terminology from stateless application tutorial.

Author: k8s-ci-robot

content/en/docs/tutorials/_index.md

@@ -33,7 +33,7 @@ Before walking through each tutorial, you may want to bookmark the
 
 * [Exposing an External IP Address to Access an Application in a Cluster](/docs/tutorials/stateless-application/expose-external-ip-address/)
 
-* [Example: Deploying PHP Guestbook application with Redis](/docs/tutorials/stateless-application/guestbook/)
+* [Example: Deploying PHP Guestbook application with MongoDB](/docs/tutorials/stateless-application/guestbook/)
 
 ## Stateful Applications