Fix typo in GCS URI parameter (GoogleCloudPlatform#2459)

Author: lwander

tables/automl/notebooks/census_income_prediction/getting_started_notebook.ipynb

@@ -510,7 +510,7 @@
    "source": [
     "import_data_operation = client.import_data(\n",
     "    dataset=dataset,\n",
-    "    gcs_input_uris=gcs_input_uris\n",
+    "    gcs_input_uris=GCS_DATASET_URI\n",
     ")\n",
     "print('Dataset import operation: {}'.format(import_data_operation))\n",
     "\n",