Fix rendering issue (#1921)

Author: sachinprasadhs

examples/structured_data/ipynb/collaborative_filtering_movielens.ipynb

@@ -352,7 +352,7 @@
     "for row in recommended_movies.itertuples():\n",
     "    print(row.title, \":\", row.genres)"
    ]
-  },
+  }
  ],
  "metadata": {
   "accelerator": "GPU",
@@ -383,4 +383,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
+}