fix: newline problem

hooks/gen_docs/utils.py

@@ -19,7 +19,7 @@ def copy_file(
     :param dest: Path to new file
     :param add_header: Whether to add header, defaults to True
     :param header: Will be placed at the top of the file, defaults to
-        ``f"<!-- This file is autogenerated by {Path(__file__).relative_to(ROOT)}. -->\n\n"``
+        ``f"<!-- This file is autogenerated by {Path(__file__).relative_to(ROOT)}. -->"``
         NOTE: The default header will only contain correct information if the caller of
         this function is the one which should be referenced in the header
     """
@@ -28,11 +28,10 @@ def copy_file(
             shutil.copyfileobj(file_source, file_dest)
             return
         if header is None:
-            header_encoded = f"<!-- This file is autogenerated by {Path(inspect.stack()[1].filename).relative_to(ROOT)}. -->\n\n"
-        else:
-            header_encoded = header
+            header = f"<!-- This file is autogenerated by {Path(inspect.stack()[1].filename).relative_to(ROOT)}. -->"
         with TemporaryFile(mode="w+") as file_header:
-            file_header.write(header_encoded)
+            file_header.write(header)
+            file_header.write("\n\n")
             file_header.seek(0)
             shutil.copyfileobj(file_header, file_dest)
             shutil.copyfileobj(file_source, file_dest)