Cmake: add a deletion of documentation directory to command make clean
Cmake: add a deletion of documentation directory to command make clean

FedoraScientific/salome-hexablock,FedoraScientific/salome-hexablock,FedoraScientific/salome-hexablock,FedoraScientific/salome-hexablock,FedoraScientific/salome-hexablock