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In light of Emacs packaging improvements such as those mentioned in #11503, and with the addition of a systemd service (#15807 and #16356), and considering that the wiki page is completely out of date (#13217), it seems that some documentation is in order.
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.