docs[patch]: add deprecated note for ErnieChatBot (#14061)

- **Description:** just a little change of ErnieChatBot class
description, sugguesting user to use more suitable class
  - **Issue:** none,
  - **Dependencies:** none,
  - **Tag maintainer:** @baskaryan ,
  - **Twitter handle:** none

docs/docs/integrations/chat/ernie.ipynb

@@ -7,7 +7,19 @@
     "# ERNIE-Bot Chat\n",
     "\n",
     "[ERNIE-Bot](https://cloud.baidu.com/doc/WENXINWORKSHOP/s/jlil56u11) is a large language model developed by Baidu, covering a huge amount of Chinese data.\n",
-    "This notebook covers how to get started with ErnieBot chat models."
+    "This notebook covers how to get started with ErnieBot chat models.\n",
+    "\n",
+    "**Note:** We recommend users using this class to switch to [Baidu Qianfan](./baidu_qianfan_endpoint). they are 3 why we recommend users to use `QianfanChatEndpoint`:\n",
+    "1. `QianfanChatEndpoint` support more LLM in the Qianfan platform.\n",
+    "2. `QianfanChatEndpoint` support streaming mode.\n",
+    "3. `QianfanChatEndpoint` support function calling usgage.\n",
+    "\n",
+    "Some tips for migration:\n",
+    "- change `ernie_client_id` to `qianfan_ak`, also change `ernie_client_secret` to `qianfan_sk`.\n",
+    "- install `qianfan` package. \n",
+    "    ```\n",
+    "    pip install qianfan\n",
+    "    ```"
    ]
   },
   {

libs/langchain/langchain/chat_models/ernie.py

@@ -54,6 +54,20 @@ class ErnieBotChat(BaseChatModel):
             from langchain.chat_models import ErnieBotChat
             chat = ErnieBotChat(model_name='ERNIE-Bot')
 
+
+    Deprecated Note:
+    Please use `QianfanChatEndpoint` instead of this class.
+    `QianfanChatEndpoint` is a more suitable choice for production.
+
+    Always test your code after changing to `QianfanChatEndpoint`.
+
+    Example of `QianfanChatEndpoint`:
+        .. code-block:: python
+
+            from langchain.chat_models import QianfanChatEndpoint
+            qianfan_chat = QianfanChatEndpoint(model="ERNIE-Bot",
+                endpoint="your_endpoint", qianfan_ak="your_ak", qianfan_sk="your_sk")
+
     """
 
     ernie_api_base: Optional[str] = None