Document builtin functions as well?

[IogaMaster]

Original Issue

https://github.com/mlvzk/manix/issues/22

Was hoping to use this to look up functions while writing Nix code but it doesn't output anything:

$ manix lib.listToAttrs
Building Home Manager Options cache...
Building NixOS Options cache...
Building Nixpkgs Tree cache...
Building Nixpkgs Documentation cache...
Here's what I found in nixpkgs: lib.listToAttrs

My thoughts

This seems like a rather important feature, especially since manix is being integrated into nix lsp's.