add some shuffle configurations in doc#2031

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CrazyJvm wants to merge 5 commits intoapache:masterfrom

CrazyJvm:conf-spill-batchSize

Commits on Aug 19, 2014

Commits on Aug 20, 2014

the config value of is case irrelevant
CrazyJvm
committed

Commits on Aug 21, 2014

style fix
CrazyJvm
committed