[SPARK-22855][BUILD] Add -no-java-comments to sbt docs/scalacOptions #20042
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Prevents Scala 2.12 scaladoc from blowing up attempting to parse java comments.
What changes were proposed in this pull request?
Adds -no-java-comments to docs/scalacOptions under Scala 2.12. Also
moves scaladoc configs out of the TestSettings and into the standard sharedSettings
section in SparkBuild.scala.
How was this patch tested?
SBT_OPTS=-Dscala-2.12 sbt
++2.12.4
tags/publishLocal