Update ChatOpenAI docs with fine-tuning example (#9632)

docs/extras/integrations/chat/openai.ipynb

@@ -143,12 +143,39 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "c095285d",
+   "cell_type": "markdown",
+   "id": "57e27714",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "source": [
+    "## Fine-tuning\n",
+    "\n",
+    "You can call fine-tuned OpenAI models by passing in your corresponding `modelName` parameter.\n",
+    "\n",
+    "This generally takes the form of `ft:{OPENAI_MODEL_NAME}:{ORG_NAME}::{MODEL_ID}`. For example:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "33c4a8b0",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "AIMessage(content=\"J'adore la programmation.\", additional_kwargs={}, example=False)"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "fine_tuned_model = ChatOpenAI(temperature=0, model_name=\"ft:gpt-3.5-turbo-0613:langchain::7qTVM5AR\")\n",
+    "\n",
+    "fine_tuned_model(messages)"
+   ]
   }
  ],
  "metadata": {
@@ -167,7 +194,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.7"
+   "version": "3.10.5"
   }
  },
  "nbformat": 4,