e0feace5cd
This is an improved version of original #12357. For the purpose of generating docs, evaluate options with each derivation in `pkgs` (recursively) replaced by a fake with path "\${pkgs.attribute.path}". It isn't perfect, but it seems to cover a vast majority of use cases. Caveat: even if the package is reached by a different means, the path above will be shown and not e.g. `${config.services.foo.package}`. As before, defaults created by `mkDefault` aren't displayed, but documentation shouldn't (mostly) be a reason to use that anymore. Note: t wouldn't be enough to just use `lib.mapAttrsRecursive`, because derivations are also (special) attribute sets.
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