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docs: qa rag nit (#16400)

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docs/docs/use_cases/question_answering/chat_history.ipynb
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@ -359,11 +359,20 @@
"Here we've gone over how to add application logic for incorporating historical outputs, but we're still manually updating the chat history and inserting it into each input. In a real Q&A application we'll want some way of persisting chat history and some way of automatically inserting and updating it.\n", "Here we've gone over how to add application logic for incorporating historical outputs, but we're still manually updating the chat history and inserting it into each input. In a real Q&A application we'll want some way of persisting chat history and some way of automatically inserting and updating it.\n",
"\n", "\n",
"For this we can use:\n", "For this we can use:\n",
"\n",
"- [BaseChatMessageHistory](/docs/modules/memory/chat_messages/): Store chat history.\n", "- [BaseChatMessageHistory](/docs/modules/memory/chat_messages/): Store chat history.\n",
"- [RunnableWithMessageHistory](/docs/expression_language/how_to/message_history): Wrapper for an LCEL chain and a `BaseChatMessageHistory` that handles injecting chat history into inputs and updating it after each invocation.\n", "- [RunnableWithMessageHistory](/docs/expression_language/how_to/message_history): Wrapper for an LCEL chain and a `BaseChatMessageHistory` that handles injecting chat history into inputs and updating it after each invocation.\n",
"\n", "\n",
"For a detailed walkthrough of how to use these classes together to create a stateful conversational chain, head to the [How to add message history (memory)](/docs/expression_language/how_to/message_history) LCEL page." "For a detailed walkthrough of how to use these classes together to create a stateful conversational chain, head to the [How to add message history (memory)](/docs/expression_language/how_to/message_history) LCEL page."
] ]
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