SPARK-13312 [MLlib] Update java train-validation-split example in ml-guide#11199

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JeremyNixon wants to merge 2 commits intoapache:masterfrom

JeremyNixon:update_train_val_split_example

Commits on Feb 12, 2016

use correct regression data in train-validation-split example
JeremyNixon
committed

Commits on Feb 14, 2016

update java train-validation-split example in ml-guide
JeremyNixon
committed