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sysctl.d(5) recommends prefixing all filenames in /etc/sysctl.d with a two-digit number and a dash, to simplify the ordering of the files. Some packages provide custom files, often with "50-" prefix. To ensure user-supplied configuration takes precedence over the one specified via `boot.kernel.sysctl`, prefix the file generated there with "60-".
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.