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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",
"\n",
"For this we can use:\n",
"\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",
"\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."
]
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