add the documentation in the implicit of org.apache.wayang.api

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add the documentation in the implicit of org.apache.wayang.api

https://github.com/apache/incubator-wayang/blob/278cbdc4bd8e87863a7cb43bc68c52ca783039c0/wayang-api/wayang-api-scala-java/code/main/scala/org/apache/wayang/api/package.scala#L41

/**
  * Provides implicits for the basic Wayang API.
  */
/**
 * TODO: add the documentation in the implicit of org.apache.wayang.api
 * labels: documentation,todo
 */
package object api {

  implicit def basicDataUnitType[T](implicit classTag: ClassTag[T]): BasicDataUnitType[T] = {

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