update titles (#653)

Author: simonpfish

examples/How_to_finetune_chat_models.ipynb

@@ -435,7 +435,7 @@
    "id": "d61cd381-63ad-4ed9-b0be-47a438891028",
    "metadata": {},
    "source": [
-    "### Create fine-tune job\n",
+    "## Fine-tuning\n",
     "\n",
     "Now we can create our fine-tuning job with the generated files and an optional suffix to identify the model. The response will contain an `id` which you can use to retrieve updates on the job.\n",
     "\n",
@@ -606,7 +606,7 @@
    "id": "0025e392-84cd-4566-a384-ea31ca43e567",
    "metadata": {},
    "source": [
-    "## Generate with the fine-tuned model"
+    "## Inference"
    ]
   },
   {