docs(adopt): bind inputs in outputs example

docs/adopt.md

@@ -28,10 +28,12 @@ On the target machine:
   };
 
   outputs =
-    { self, nixpkgs, nanuqsaurus, ... }:
+    inputs@{ self, nixpkgs, nanuqsaurus, ... }:
     {
       nixosConfigurations.my-host = nixpkgs.lib.nixosSystem {
         system = "x86_64-linux";
+        # Only needed if your local modules require access to flake inputs.
+        specialArgs = { inherit inputs; };
         modules = [
           ./hardware-configuration.nix
           nanuqsaurus.nixosModules.nanuqsaurus