## What changes were proposed in this pull request?

Minor typo fixes in Dataset scaladoc
* Corrected context type as SparkSession, not SQLContext.
liancheng rxin andrewor14

## How was this patch tested?

Compiled locally

Author: Xinh Huynh <xinh_huynh@yahoo.com>

Closes #13330 from xinhhuynh/fix-dataset-typos.