[2/2] spark git commit: [SPARK-14995][R] Add `since` tag in Roxygen documentation for SparkR API methods

[SPARK-14995][R] Add `since` tag in Roxygen documentation for SparkR API methods ## What changes were proposed in this pull request? This PR adds `since` tags to Roxygen documentation according to the previous documentation archive. https://home.apache.org/~dongjoon/spark-2.0.0-docs/api/R/ ##

[2/2] spark git commit: [SPARK-14995][R] Add `since` tag in Roxygen documentation for SparkR API methods

[SPARK-14995][R] Add `since` tag in Roxygen documentation for SparkR API methods ## What changes were proposed in this pull request? This PR adds `since` tags to Roxygen documentation according to the previous documentation archive. https://home.apache.org/~dongjoon/spark-2.0.0-docs/api/R/ ##