Add note about davfs2 group creation

[Koruudo]

I just went through setting up davfs2 on Arch and it did not create the davfs2 group for me. I also had to edit the config to make it use the group, once I created it, because it was defaulting to network. I was getting the following error when trying to mount it:

user must be member of group network

Please feel free to adjust my comment if need be. :)

🖼️ Screenshots

[Koruudo]

Does ** make it bold? I thought that was making it a comment box, my bad.

[tflidd]

Does ** make it bold?

Yes: https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html

Or just look at the page itself how the note boxes are realized just a bit above. Besides of the bold writing, I'd be ok for your PR.

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[rakekniven]

Does ** make it bold? I thought that was making it a comment box, my bad.

Remove boldness to get this PR merged. Thanks.