[SPARK-12760] [DOCS] inaccurate description for difference between local vs cluster mode in closure handling#10866

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srowen:SPARK-12760

Commits on Jan 21, 2016

Clarify that modifying a driver local variable won't have the desired effect in cluster modes, and may or may not work as intended in local mode
srowen
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Commits on Jan 23, 2016

Fix typo, improve sentence
srowen
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