DOCS: rag nit (#13436)

docs/docs/use_cases/question_answering/index.ipynb

@@ -1051,14 +1051,6 @@
     ":::"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "id": "e6e5191f-43e6-4fa0-9ba5-db002fcaacf3",
-   "metadata": {},
-   "source": [
-    "Of course, we've written here the logic for using chat history when it's provided, but we haven't actually added functionality for storing chat history for each user session. This is something that's fairly application specific and is usually best handled outside of LangChain."
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "580e18de-132d-4009-ba67-4aaf2c7717a2",