Update quickstart python dataset example #19283
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The python spark datasets example for the mapreduce was returning error, when using .select().as() function.
Replaces the error to use the .select().name() function, that does the same thing and works
What changes were proposed in this pull request?
no changes
How was this patch tested?
no significant changes were made to the spark code. Just documentation changes. The change I implemented was tested manually over spark 2.2.0
Please review http://spark.apache.org/contributing.html before opening a pull request.