[SPARK-8909][Documentation] Change the scala example in sql-programmi…

…ng-guide#Manually Specifying Options to be in sync with java,python, R version

Author: Alok Singh <“singhal@us.ibm.com”>

Closes #7299 from aloknsingh/aloknsingh_SPARK-8909 and squashes the following commits:

d3c20ba [Alok Singh] fix the file to .parquet from .json
d476140 [Alok Singh] [SPARK-8909][Documentation] Change the scala example in sql-programming-guide#Manually Specifying Options to be in sync with java,python, R version