SPARKC-94: update docs to reflect rename of cassandra port setting
SPARKC-94: update docs to reflect rename of cassandra port setting

viirya/spark-cassandra-connector,rafaelbarreto87/spark-cassandra-connector,christobill/spark-cassandra-connector,christobill/spark-cassandra-connector,uncommoncode/spark-cassandra-connector,uncommoncode/spark-cassandra-connector,shenyanls/spark-cassandra-connector,jaceklaskowski/spark-cassandra-connector,debasish83/cassandra-driver-spark,maasg/spark-cassandra-connector,ponkin/spark-cassandra-connector,shenyanls/spark-cassandra-connector,debasish83/cassandra-driver-spark,viirya/spark-cassandra-connector,shashwat7/spark-cassandra-connector,jimenefe/spark-cassandra-connector,jaceklaskowski/spark-cassandra-connector,jimenefe/spark-cassandra-connector,himanshu14/spark-cassandra-connector,datastax/spark-cassandra-connector,ponkin/spark-cassandra-connector,datastax/spark-cassandra-connector,shashwat7/spark-cassandra-connector,rafaelbarreto87/spark-cassandra-connector,maasg/spark-cassandra-connector,himanshu14/spark-cassandra-connector