Fixed invalid spark-1.6.0 mirror in Spark data collection demo docs
Fixed invalid spark-1.6.0 mirror in Spark data collection demo docs

kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps,kaaproject/sample-apps