[SPARK-31748][PYTHON][3.0] Document resource module in PySpark doc and rename/move classes#28586

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Commits on May 20, 2020

[SPARK-31748][PYTHON][3.0] Document resource module in PySpark doc and rename/move classes
HyukjinKwon
committed
Port some changes from SPARK-29641 for Python 2 compat
HyukjinKwon
committed