fix: doc string of default params in chat_models, llm qianfan (#12153)

- **Description:** a fix of the doc string in Qianfan
  - **Issue:** no
  - **Dependencies:** no
  - **Tag maintainer:** @baskaryan
  - **Twitter handle:** no

libs/langchain/langchain/chat_models/baidu_qianfan_endpoint.py

@@ -169,7 +169,7 @@ class QianfanChatEndpoint(BaseChatModel):
 
     @property
     def _default_params(self) -> Dict[str, Any]:
-        """Get the default parameters for calling OpenAI API."""
+        """Get the default parameters for calling Qianfan API."""
         normal_params = {
             "model": self.model,
             "endpoint": self.endpoint,

libs/langchain/langchain/llms/baidu_qianfan_endpoint.py

@@ -116,7 +116,7 @@ class QianfanLLMEndpoint(LLM):
 
     @property
     def _default_params(self) -> Dict[str, Any]:
-        """Get the default parameters for calling OpenAI API."""
+        """Get the default parameters for calling Qianfan API."""
         normal_params = {
             "model": self.model,
             "endpoint": self.endpoint,