docs: undo changes to classification tutorial

This prevents merge conflicts since others are currently working on the tutorial as well.

docs/tutorials/classification.ipynb

@@ -55,7 +55,7 @@
    "source": [
     "train_table, testing_table = titanic.split_rows(0.6)\n",
     "\n",
-    "test_table = testing_table.remove_columns([\"fare\"]).shuffle_rows()"
+    "test_table = testing_table.remove_columns([\"survived\"]).shuffle_rows()"
    ]
   },
   {
@@ -171,8 +171,6 @@
     "prediction = fitted_model.predict(\n",
     "    transformed_test_table\n",
     ")\n",
-    "\n",
-    "\n",
     "#For visualisation purposes we only print out the first 15 rows.\n",
     "prediction.to_table().slice_rows(start=0, length=15)"
    ]