Merge redundant steps in guide

HPC_Python_Guide.md

@@ -72,17 +72,15 @@ a100sh
    pip install jupyter jupyterlab
    ```
 
-5. Start Jupyter notebooks with
+5. Start Jupyter lab with
    ```
-   jupyter notebook
+   jupyter lab
    ```
-   This should open a browser with the Jupyter notebooks interface.
-
-6. Start Jupyter labs with
+   **...or** start Jupyter notebooks with
    ```
-   jupyter lab
+   jupyter notebook
    ```
-   This should open a browser with the Jupyter lab interface.
+   This should open a browser with the Jupyter notebook or jupyter lab interface.
    > __Troubleshooting:__ Sometimes Jupyter lab has some issues and you need to revert to Jupyter notebooks.
 
 ## V. Jupyter notebooks on the cluster in your own browser