Copied from #7991:

If you look at https://certbot.eff.org/docs/api/certbot.compat.filesystem.html, you'll notice many formatting errors which should be fixed.

That's the bare minimum which I think should be done, but I think we should also see what we can do to avoid these problems from happening in the future. Is there a way we could build the docs in CI and check for these problems? Unfortunately, Sphinx doesn't seem to currently warn about all of the problems here, at least with the warnings it currently has. (Maybe new warnings will appear after others are fixed?)

Finding a way to better catch these problems could be left for future work.

Now that those specific errors are fixed, we should also find a way to automatically check for them.