updated interface jupyter notebook explanations (#8689)

Updated the documentation in the interface.ipynb to clearly show the
_input_ and _output_ types for various components @baskaryan

docs/extras/guides/expression_language/interface.ipynb

@@ -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."
    ]