CI: Improve error message format in validate_docstrings.py (#56827)

Author: luke396

scripts/validate_docstrings.py

@@ -392,7 +392,7 @@ def header(title, width=80, char="#") -> str:
     if result["errors"]:
         sys.stderr.write(f'{len(result["errors"])} Errors found for `{func_name}`:\n')
         for err_code, err_desc in result["errors"]:
-            sys.stderr.write(f"\t{err_desc}\n")
+            sys.stderr.write(f"\t{err_code}\t{err_desc}\n")
     else:
         sys.stderr.write(f'Docstring for "{func_name}" correct. :)\n')