nixos/syncthing: install syncthing command and man page

Before this change, setting services.syncthing.enable to true would
enable Syncthing, but it wouldn’t add Syncthing’s man page to your
system. This change ensures that the man page is available.

I tested this change using this Nix expression:

  let
    nixpkgsRepo = /path/to/nixpkgs/repo;
    pkgs = import nixpkgsRepo { };
  in pkgs.testers.runNixOSTest {
    name = "syncthing-man-page-test";
    nodes.machine = {
      services.syncthing.enable = true;
    };
    testScript = ''
      start_all()
      machine.succeed("man syncthing > log.txt")
      machine.copy_from_vm("log.txt", ".")
    '';
  }

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