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The server is not verified over the git:// transfer protocol. If you clone a repository over git://, you should check if the latest commit's hash is correct. On the other hand, https:// will always verify the server automatically, using certificate authorities.
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.