[SPARK-24408][SQL][DOC] Move abs function to math_funcs group#21448

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jaceklaskowski:SPARK-24408-math-funcs-doc

Commits on May 29, 2018

[SPARK-24408][SQL][DOC] Move abs, bitwiseNOT, isnan, nanvl functions to math_funcs group
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Fixing Scala style tests
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Commits on Jun 28, 2018

Reverting some changes after code review
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