Add a comment about the command used to compute the hash

Author: sestrella

flake.nix

@@ -57,6 +57,9 @@
                   tag = "v${version}";
                 };
               };
+            # INFO: The hashes in the JSON file were computed with the following command:
+            #
+            # nix flake prefetch github:opentofu/opentofu?ref=v1.10.1
             openTofuVersions = builtins.fromJSON (builtins.readFile ./opentofu.json);
             openTofuReleases = pkgs.lib.mapAttrs'
               (