[SPARKR][MINOR] Update R DESCRIPTION file
[SPARKR][MINOR] Update R DESCRIPTION file

## What changes were proposed in this pull request?

Update DESCRIPTION

## How was this patch tested?

Run install and CRAN tests

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #14764 from felixcheung/rpackagedescription.

(cherry picked from commit d2b3d3e63e1a9217de6ef507c350308017664a62)
Signed-off-by: Xiangrui Meng <9616cf314f60cbadfd3d5d51110130ad7923defb@databricks.com>

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