add the documentation in the methods of org.apache.wayang.api.util.DataQuantaBui...

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add the documentation in the methods of org.apache.wayang.api.util.DataQuantaBuilderDecorator

https://github.com/apache/incubator-wayang/blob/278cbdc4bd8e87863a7cb43bc68c52ca783039c0/wayang-api/wayang-api-scala-java/code/main/scala/org/apache/wayang/api/util/DataQuantaBuilderDecorator.scala#L31

/**
  * Utility to extend a [[DataQuantaBuilder]]'s functionality by decoration.
  */
/**
 * TODO: add the documentation in the methods of org.apache.wayang.api.util.DataQuantaBuilderDecorator
 * labels: documentation,todo
 */
abstract class DataQuantaBuilderDecorator[This <: DataQuantaBuilder[This, Out], Out]
(baseBuilder: DataQuantaBuilder[_, Out])
  extends DataQuantaBuilder[This, Out] {

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