[SPARK-25023] Clarify Spark security documentation#22852

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tgravescs wants to merge 5 commits intoapache:masterfrom

tgravescs:SPARK-25023

Commits on Oct 26, 2018

[SPARK-25023] Clarify Spark security documentation
Thomas Graves
committed
review feedback
Thomas Graves
committed
add period
Thomas Graves
committed

Commits on Oct 30, 2018

Add security section to overview and quickstart
Thomas Graves
committed
add security section to the resource manager docs
Thomas Graves
committed