This PR fixes several issues in our Scala and Java API doc.

• Hides spark.memory package

• Hides spark.examples package

• Fixes ScalaDoc unordered list format through out the code base

  Unordoreed list in ScalaDoc requires an extra space before - or *, i.e.:

  /**
    * A list:
    *
    *  - Item 1
    *  - Item 2
    */

  rather than

  /**
    * A list:
    *
    * - Item 1
    * - Item 2
    */

  Otherwise the list won't be properly rendered.

• Some other minor formatting issues

Remaining issues that I haven't figured out a proper fix:

• :: DeveloperApi :: badge is not rendered properly on my local machine, but not sure whether it's an environmental issue.

• akka package still appears in ScalaDoc root package page, even though it's already filtered in SparkBuild.scala.

• Seems that most stuff in spark.util shouldn't be public, e.g.

  • RpcUtils
  • InnerClosureFinder

  But they've been there for a long time. Not sure whether they are already considered as part of the public API?

• KinesisUtilsPythonHelper shows up in JavaDoc even though it's marked as private