Update how-to-restart-server-portal.md

Author: GennadNY

articles/postgresql/flexible-server/how-to-restart-server-portal.md

@@ -43,6 +43,8 @@ Follow these steps to restart your flexible server.
 6.  A notification will be shown that the restart operation has been
     initiated.
 
+> [!NOTE]
+> Using custom RBAC role to restart server please make sure that in addition to Microsoft.DBforPostgreSQL/flexibleServers/restart/action permission this role also has Microsoft.DbforPostgreSQL/servers/write permission granted to it. 
 ## Next steps
 
 -   Learn about [business continuity](./concepts-business-continuity.md)