Remove code block formatting from feedback section

code/chapter4/Reflection.py

@@ -84,9 +84,7 @@ REFINE_PROMPT_TEMPLATE = """
 {task}
 
 # 你上一轮尝试的代码:
-```python
 {last_code_attempt}
-```
 
 # 评审员的反馈:
 {feedback}