nixos/nixos-generate-config: update search command

nixos/modules/installer/tools/nixos-generate-config.pl

@@ -577,8 +577,8 @@ $bootLoaderConfig
   # Set your time zone.
   # time.timeZone = "Europe/Amsterdam";
 
-  # List packages installed in system profile. To search by name, run:
-  # \$ nix-env -qaP | grep wget
+  # List packages installed in system profile. To search, run:
+  # \$ nix search wget
   # environment.systemPackages = with pkgs; [
   #   wget vim
   # ];