doc: fix typo in message_history.ipynb (#16877)

- **Description:** just fixed a small typo in the documentation in the
`expression_language/how_to/message_history` session
[here](https://python.langchain.com/docs/expression_language/how_to/message_history)
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akira wu 2024-02-02 05:30:29 +08:00 committed by GitHub
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@ -7,7 +7,7 @@
"source": [ "source": [
"# Add message history (memory)\n", "# Add message history (memory)\n",
"\n", "\n",
"The `RunnableWithMessageHistory` let's us add message history to certain types of chains.\n", "The `RunnableWithMessageHistory` let us add message history to certain types of chains.\n",
"\n", "\n",
"Specifically, it can be used for any Runnable that takes as input one of\n", "Specifically, it can be used for any Runnable that takes as input one of\n",
"\n", "\n",