Add comment for encapsulating getting the root and getting its bounding volume in BVH::bounds()
Add comment for encapsulating getting the root and getting its bounding volume in BVH::bounds()

ORNL-CEES/DataTransferKit,Rombur/DataTransferKit,Rombur/DataTransferKit,dalg24/DataTransferKit,dalg24/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,ORNL-CEES/DataTransferKit