In project settings I can check Activate project documentation. After that, a new Docs tab appears, and when I click it, it shows Project not found error. I'm utterly confused how project documentation works. I can't find any setting that would allow me to specify which URL should be used for the Docs tab.

Eventually, I found pagure documentation (which was quite difficult, see #1408). But that doesn't explain it either. It says:

Activate project documentation
Pagure offers the option to have a git repository specific for the documentation of the project.
This repository is then accessible under the Docs tab in the menu of the project.
If you prefer to store your documentation elsewhere or maybe even within the sources of the project, you can disable the Docs tab by un-checking this option.

It says I can have a specific git repository for documentation, but it does not say how to configure it. What should I do in order to have documentation in Pagure? I still don't know.

Could you please make the documentation more useful, and then link to it from the Docs tab instead of displaying Project not found error? That would be very helpful. Thanks.