docs: deprecation of max_length parameter used in Exa search (#22567)

docs/docs/integrations/tools/exa_search.ipynb

@@ -65,6 +65,17 @@
     "ExaSearchRetriever is a retriever that uses Exa Search to retrieve relevant documents."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    ":::{.callout-note}\n",
+    "\n",
+    "The `max_characters` parameter for **TextContentsOptions** used to be called `max_length` which is now deprecated. Make sure to use `max_characters` instead.\n",
+    "\n",
+    ":::"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 10,
@@ -96,7 +107,7 @@
     "\n",
     "# retrieve 5 documents, with content truncated at 1000 characters\n",
     "retriever = ExaSearchRetriever(\n",
-    "    k=5, text_contents_options=TextContentsOptions(max_length=200)\n",
+    "    k=5, text_contents_options=TextContentsOptions(max_characters=200)\n",
     ")\n",
     "\n",
     "prompt = PromptTemplate.from_template(\n",