fix chapter4

docs/chapter4/第四章 智能体经典范式构建.md

@@ -1091,7 +1091,7 @@ class ReflectionAgent:
     def _get_llm_response(self, prompt: str) -> str:
         """一个辅助方法，用于调用LLM并获取完整的流式响应。"""
         messages = [{"role": "user", "content": prompt}]
-        rresponse_text = self.llm_client.think(messages=messages) or ""
+        response_text = self.llm_client.think(messages=messages) or ""
         return response_text
 
 ```