Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/15747
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GitHub user felixcheung opened a pull request:
https://github.com/apache/spark/pull/15747
[SPARK-14393][SQL][DOC] update doc for python and R
## What changes were proposed in this pull request?
minor doc update that should go to master & branch-2.1
## How was this
