Clarify Patroni upgrade instructions

doc/administration/postgresql/replication_and_failover.md

@@ -1029,7 +1029,7 @@ Considering these, you should carefully plan your PostgreSQL upgrade:
    ```
 
    NOTE:
-   `gitlab-ctl pg-upgrade` tries to detect the role of the node. If for any reason the auto-detection does not work or you believe it did not detect the role correctly, you can use the `--leader` or `--replica` arguments to manually override it.
+   On a Geo secondary site, the Patroni leader node is called `standby leader`.
 
 1. Stop Patroni **only on replicas**.
 
@@ -1049,6 +1049,11 @@ Considering these, you should carefully plan your PostgreSQL upgrade:
    sudo gitlab-ctl pg-upgrade -V 12
    ```
 
+   NOTE:
+   `gitlab-ctl pg-upgrade` tries to detect the role of the node. If for any reason the auto-detection
+   does not work or you believe it did not detect the role correctly, you can use the `--leader` or
+   `--replica` arguments to manually override it.
+
 1. Check the status of the leader and cluster. You can proceed only if you have a healthy leader:
 
    ```shell