[flagged]
The term actually predates Git (SourceForge started with CVS and SVN IIRC).
I am not saying documentation should not be better — it should — but I am surprised someone in software development would not know of the term. And knowing how good free software projects are at documentation, not turn to searches first (or is it just software projects? I've recently tried to find out what VMWare product I can run virtual machines on Windows with, and it took me a bit too).
Edit: the homepage at https://forgejo.org/ actually has phrases like "self-host your projects and get everyone involved in delivering quality software on the same page" or "Self-hosted alternative to GitHub"