Add a generated comment in *_generated.go in the style used by go generate

gen-go-code.py

@@ -3,16 +3,16 @@
 
 import io
 import json
+import os
 import sys
-from functools import lru_cache
 from contextlib import contextmanager, suppress
+from functools import lru_cache
 from typing import Dict, Iterator, List, Set, Tuple, Union
 
 import kitty.constants as kc
 from kittens.tui.operations import Mode
 from kitty.cli import (
-    GoOption, go_options_for_seq, parse_option_spec,
-    serialize_as_go_string
+    GoOption, go_options_for_seq, parse_option_spec, serialize_as_go_string
 )
 from kitty.key_encoding import config_mod_map
 from kitty.key_names import (
@@ -220,8 +220,6 @@ def generate_constants() -> str:
     ref_map = load_ref_map()
     dp = ", ".join(map(lambda x: f'"{serialize_as_go_string(x)}"', kc.default_pager_for_help))
     return f'''\
-// auto-generated by {__file__} do no edit
-
 package kitty
 
 type VersionType struct {{
@@ -253,6 +251,7 @@ def replace_if_needed(path: str) -> Iterator[io.StringIO]:
     with suppress(FileNotFoundError), open(path, 'r') as f:
         orig = f.read()
     new = buf.getvalue()
+    new = f'// Code generated by {os.path.basename(__file__)}; DO NOT EDIT.\n\n' + new
     if orig != new:
         changed.append(path)
         with open(path, 'w') as f: