Nixpkgs: Option `nix.useSandbox` not fully explained

[ikervagyok]

https://github.com/NixOS/nixpkgs/blob/83dcbb82fb7ba010503802a5f125a167f0ff8e5a/nixos/modules/services/misc/nix-daemon.nix#L117 The description of nix.useSandbox does not explain the effect of setting it to relaxed

[vcunat]

So we add a link to nix docs or something? I don't think it's useful to duplicate such detailed information.

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