[Spark-16508][SparkR] Split docs for arrange and orderBy methods#14522

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junyangq wants to merge 4 commits intoapache:masterfrom junyangq:SPARK-16508-0

+17-15

Commits on Aug 7, 2016

Separate docs for arrange and orderBy methods according to their functionality
junyangq
committed
Move detailed doc of orderBy from generic.R to WindowSpec.R
junyangq
committed

Commits on Aug 8, 2016

Minor fixes of name and rdname
junyangq
committed

Commits on Aug 10, 2016

Fix Rd files with duplicated alias 'orderBy'
junyangq
committed