change patches method after registry flag refactoring

Author: mbussolotto

pages/patches.html

@@ -109,7 +109,7 @@ <h4><a href="#server">Server</a></h4>
                   <code>$ sudo reboot</code>
                 </li>
                 <li>Update the server container:
-                  <code>$ sudo mgradm upgrade podman --image registry.opensuse.org/systemsmanagement/uyuni/stable/patches/containers/uyuni/server --registry registry.opensuse.org</code>
+                  <code>$ sudo mgradm upgrade podman --image systemsmanagement/uyuni/stable/patches/containers/uyuni/server</code>
                 </li>
               </ol>
             </div>