[2/2] spark git commit: [SPARK-6824] Fill the docs for DataFrame API in SparkR

[SPARK-6824] Fill the docs for DataFrame API in SparkR This patch also removes the RDD docs from being built as a part of roxygen just by the method to delete ' ' of \#' . Author: hqzizania qian.hu...@intel.com Author: qhuang qian.hu...@intel.com Closes #5969 from hqzizania/R1 and squashes

[2/2] spark git commit: [SPARK-6824] Fill the docs for DataFrame API in SparkR

[SPARK-6824] Fill the docs for DataFrame API in SparkR This patch also removes the RDD docs from being built as a part of roxygen just by the method to delete ' ' of \#' . Author: hqzizania qian.hu...@intel.com Author: qhuang qian.hu...@intel.com Closes #5969 from hqzizania/R1 and squashes