Before the release, we need to update the SparkR Programming Guide, its migration guide, and the R vignettes. Updates will include:
- Add migration guide subsection.
- Use the results of the QA audit JIRAs.
- Check phrasing, especially in main sections (for outdated items such as "In this release, ...")
- Update R vignettes
Note: This task is for large changes to the guides. New features are handled in