update by comment

Author: Yancey0623

example/jupyter/.gitignore

@@ -0,0 +1 @@
+.ipynb_checkpoints

example/jupyter/tutorial_xgboost.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# XGBoost on SQLFlow Tutorial\n",
     "\n",
-    "This is a tutorial on train/predict XGBoost model in SQLFLow, you can find the design doc from [here](https://github.com/sql-machine-learning/sqlflow/blob/develop/doc/xgboost_on_sqlflow_design.md), in this tutorial you will know how to:\n",
+    "This is a tutorial on train/predict XGBoost model in SQLFLow, you can find more SQLFlow usage from the [User Guide](https://github.com/sql-machine-learning/sqlflow/blob/develop/doc/user_guide.md), in this tutorial you will know how to:\n",
     "- Train a XGBoost model to fit the boston housing price; and\n",
     "- Predict the housing price using the trained model;\n",
     "\n",