[SPARK-17940][SQL] Fixed a typo in LAST function and improved its usage string#15487

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lins05:spark-17940-typo-in-last-func

Commits on Oct 14, 2016

[SPARK-17940][SQL] Fixed a typo in LAST function and improved its usage string.
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Commits on Oct 16, 2016

Added the note about nondeterministic.
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Commits on Oct 18, 2016

Improve usage string format.
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