[chore] add finetune notebook

Author: yashbonde

cookbooks/finetuning.ipynb

@@ -105,7 +105,7 @@
             ],
             "source": [
                 "ft = te.FinetuningAPI(\n",
-                "    tune_api_key=\"nbx_Ic5saENtNAbdvGZidmnScRq02S8yevoEbK0\",\n",
+                "    tune_api_key=\"xxxxx\",\n",
                 "    tune_org_id=\"e3365ae7-ceeb-425b-b983-1703e8456f76\",\n",
                 ")\n",
                 "out = ft.upload_dataset(\n",