=doc Typed actors chapter improvement

*Scala version:
Added package tag `` around scala.None and .Some[_];
Added "[_]" after scala.Some statement;
Removed japi part, because its a Scala documentation version;

*Java version
Fixed wrong path to japi.Option.Some and None
Added package tag ``
Removed scala packages (i know about implicit conversion, but i think it mght be beter)
Merge pull request #1999 from ppiotrow/docTypedActorsFix

=doc Typed actors chapter improvement