license head missing or expired

[nvliyuan]

Following files missed copyright/license header or expired:
docs/get-started/xgboost-examples/csp/databricks/init.sh
examples/ML+DL-Examples/Optuna-Spark/optuna-examples/databricks/init_optuna.sh
examples/ML+DL-Examples/Optuna-Spark/optuna-examples/databricks/start_cluster.sh
examples/UDF-Examples/RAPIDS-accelerated-UDFs/pom.xml

[nvliyuan]

this issue will be fix by devs