All the official documentation is autogenerated daily. What documentation did you find outdated?
Autogenerated means "we take these particular strings and texts and dump them in a different format". It says nothing about whether they are even remotely up to date.
More importantly, much of the documentation is auto generated not from arbitrary doc strings, but from the nix expressions themselves. IE: https://search.nixos.org/options?
So I believe there was another source of the misinformation then the official docs.
[1]: https://nixos.org/guides/nix-pills/enter-environment.html