Expanded doxygen function comment for SlicerLayer::connectOpenPolylinesImpl.
Expanded doxygen function comment for SlicerLayer::connectOpenPolylinesImpl.

Ultimaker/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine