fix: correct behaviour of code fix (#24152)

Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/llm_generator/prompts.py

@@ -414,7 +414,7 @@ When you are modifying the code, you should remember:
 - Get inputs from the parameters of the function and have explicit type annotations.
 - Write proper imports at the top of the code.
 - Use return statement to return the result.
-- You should return a `dict`.
+- You should return a `dict`. If you need to return a `result: str`, you should `return {"result": result}`.
 Your output must strictly follow the schema format, do not output any content outside of the JSON body.
 """  # noqa: E501