docs: nur and unstable

modules/nur-and-unstable.nix

@@ -1,6 +1,6 @@
 { config, pkgs, ... }:
 {
-  # Import NUR.
+  # How NUR (or unstable) can be imported without `niv`.
   #nixpkgs.config.packageOverrides = pkgs: {
   #  nur = import (builtins.fetchTarball "https://github.com/nix-community/NUR/archive/master.tar.gz") {
   #    inherit pkgs;
@@ -18,8 +18,10 @@
     };
   };
 
-  # Test if NUR was imported successfully.
   #environment.systemPackages = with pkgs; [
+  #  # Example NUR usage:
   #  nur.repos.mic92.hello-nur
+  #  # Example unstable usage:
+  #  unstable.nano
   #];
 }