add note that a replica is required for the pgbouncer and pgpool sidecars to work in the current operator implementation

Author: jmccormick2001

hugo/content/getting-started/_index.adoc

@@ -1412,6 +1412,10 @@ You can also add pgbouncer after a cluster has been created:
 pgo create pgbouncer mycluster
 ....
 
+NOTE:  currently you are required to have a replica in your PG
+cluster for the pgbouncer sidecar to effectively work, a replica
+is currently not automatically created when you create a PG cluster.
+
 == pgpool Basics
 
 Adding a pgpool deployment into your PG cluster follows
@@ -1467,6 +1471,10 @@ Create a pgpool:
 pgo create pgpool mycluster
 ....
 
+NOTE:  currently you are required to have a replica in your PG
+cluster for the pgpool sidecar to effectively work, a replica
+is currently not automatically created when you create a PG cluster.
+
 === Delete pgpool
 
 The `delete pgpool` command will by delete the pgpool deployment that