SPARK-4610 addendum: [Minor] [MLlib] Minor doc fix in GBT classification example

numClassesForClassification has been renamed to numClasses.

Author: MechCoder <manojkumarsivaraj334@gmail.com>

Closes #4672 from MechCoder/minor-doc and squashes the following commits:

d2ddb7f [MechCoder] Minor doc fix in GBT classification example

docs/mllib-ensembles.md

@@ -458,7 +458,7 @@ val (trainingData, testData) = (splits(0), splits(1))
 //  The defaultParams for Classification use LogLoss by default.
 val boostingStrategy = BoostingStrategy.defaultParams("Classification")
 boostingStrategy.numIterations = 3 // Note: Use more iterations in practice.
-boostingStrategy.treeStrategy.numClassesForClassification = 2
+boostingStrategy.treeStrategy.numClasses = 2
 boostingStrategy.treeStrategy.maxDepth = 5
 //  Empty categoricalFeaturesInfo indicates all features are continuous.
 boostingStrategy.treeStrategy.categoricalFeaturesInfo = Map[Int, Int]()