Merge pull request #25035 from piotrromanski/wip-fix-math-abs-usage

Handle a negative value returned by Math.abs()

akka-docs/src/test/scala/docs/stream/HubsDocSpec.scala

@@ -118,7 +118,7 @@ class HubsDocSpec extends AkkaSpec with CompileOnlySpec {
       // value to the left is used)
       val runnableGraph: RunnableGraph[Source[String, NotUsed]] =
         producer.toMat(PartitionHub.sink(
-          (size, elem) ⇒ math.abs(elem.hashCode) % size,
+          (size, elem) ⇒ math.abs(elem.hashCode % size),
           startAfterNrOfConsumers = 2, bufferSize = 256))(Keep.right)
 
       // By running/materializing the producer, we get back a Source, which