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updated interface jupyter notebook explanations (#8689)

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Updated the documentation in the interface.ipynb to clearly show the
_input_ and _output_ types for various components @baskaryan
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docs/extras/guides/expression_language/interface.ipynb
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@ -19,9 +19,22 @@
"- `ainvoke`: call the chain on an input async\n",
"- `abatch`: call the chain on a list of inputs async\n",
"\n",
"The type of the input varies by component. For a prompt it is a dictionary, for a retriever it is a single string, for a model either a single string, a list of chat messages, or a PromptValue.\n",
"The type of the input varies by component:\n",
"\n",
"The output type also varies by component. For an LLM it is a string, for a ChatModel it's a ChatMessage, for a prompt it's a PromptValue, for a retriever it's a list of documents.\n",
"| Component | Input Type |\n",
"| --- | --- |\n",
"|Prompt|Dictionary|\n",
"|Retriever|Single string|\n",
"|Model| Single string, list of chat messages or a PromptValue|\n",
"\n",
"The output type also varies by component:\n",
"\n",
"| Component | Output Type |\n",
"| --- | --- |\n",
"| LLM | String |\n",
"| ChatModel | ChatMessage |\n",
"| Prompt | PromptValue |\n",
"| Retriever | List of documents |\n",
"\n",
"Let's take a look at these methods! To do so, we'll create a super simple PromptTemplate + ChatModel chain."
]