Add docs for Patroni reload and restart sub-commands

doc/administration/postgresql/replication_and_failover.md

@@ -1269,6 +1269,11 @@ with:
 sudo gitlab-ctl stop patroni
 ```
 
+Note that stopping or restarting Patroni service on the leader node will trigger the automatic failover. If you
+want to signal Patroni to reload its configuration or restart PostgreSQL process without triggering the failover, you
+must use the `reload` or `restart` sub-commands of `gitlab-ctl patroni` instead. These two sub-commands are wrappers of
+the same `patronictl` commands.
+
 ### Manual failover procedure for Patroni
 
 While Patroni supports automatic failover, you also have the ability to perform