205a9f2576
* improve nix installation instructions in the command $ bash <(curl https://nixos.org/nix/install) <(..) is a bashism. The documentation now show a command that does not require to be executed by bash.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.