Fix section numbering

HPC_Python_Guide.md

@@ -53,7 +53,7 @@ a100sh
 5. Your are done! You can now install packages with `pip install <PACKAGE>` and run python3 code with `python`.
    > __Troubleshooting:__ If pip doesn't work, you may need to manually install it with: `easy_install pip`
 
-## IV. Jupyter notebooks on ThinLinc
+## III. Jupyter notebooks on ThinLinc
 
 1. Open a terminal (Applications->Terminal Emulator).
 
@@ -83,7 +83,7 @@ a100sh
    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
+## IV. Jupyter notebooks on the cluster in your own browser
 
 > __WARNING:__ This will be a bit involved...
 > Credit goes to Niels Jeppesen who figured all this out.