Fix typo in mlflow code example in mlflow.py (#26931)

- [x] PR title: Fix typo in code example in mlflow.py
- In libs/community/langchain_community/chat_models/mlflow.py

libs/community/langchain_community/chat_models/mlflow.py

@@ -68,7 +68,7 @@ class ChatMlflow(BaseChatModel):
             chat = ChatMlflow(
                 target_uri="http://localhost:5000",
                 endpoint="chat",
-                temperature-0.1,
+                temperature=0.1,
             )
     """