The example is missing a `;` which causes this error when you attempt
a `darwin-rebuild switch`.
```
error: syntax error, unexpected '=', expecting ';'
at /Users/968713/.nixpkgs/darwin-configuration.nix:17:30:
16| }
17| home-manager.users.eve = { pkgs, ... }: {
| ^
18| home.packages = [
```
The `optionsDocBook` function is deprecated in nixpkgs since
nixos-23.11. This commit updates the manual and manpages to
use commonmark formatted documentation instead of the deprecated
docbook format.
