fixes for Jupyter related pages

doc.zih.tu-dresden.de/docs/access/jupyterlab.md

@@ -2,6 +2,8 @@
 
 ## Access without JupyterHub
 
+### Access with port forwarding
+
    ```console
    [marie@login ~]$ start_jupyterlab.sh
    ```
@@ -29,7 +31,7 @@ Wait until you receive a message with further instructions on how to connect to
    EOF
    ```
 
-### Other alternative for starting your jupyterlab
+### Access with X11 forwarding
 
 === "alpha"