## What changes were proposed in this pull request?

Some appNames in ML examples are incorrect, mostly in PySpark but one in Scala.  This corrects the names.

## How was this patch tested?
Style, local tests

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #13949 from BryanCutler/pyspark-example-appNames-fix-SPARK-16261.