Add a warning for Hive 2.1.1 ORC reader issue

As of Spark 2.3 and Hive 2.3, both supports using apache/orc as orc writer and reader. In older version of Hive, orc reader(isn't forward-compitaient) implemented by its own.

So Hive 2.2 and older can not read orc table created by spark 2.3 and newer which using apache/orc instead of Hive orc.

I think we should add these information into Spark2.4 orc configuration file : https://spark.apache.org/docs/2.4.0/sql-data-sources-orc.html