remove empty 'Description' from various .C files

...ble/rhoCentralFoam/BCs/U/maxwellSlipUFvPatchVectorField.C

...Cs/mixedFixedValueSlip/mixedFixedValueSlipFvPatchFields.C

...cations/utilities/mesh/advanced/modifyMesh/cellSplitter.C

applications/utilities/mesh/conversion/cfx4ToFoam/block.C

applications/utilities/mesh/conversion/cfx4ToFoam/hexBlock.C

...ties/mesh/conversion/sammToFoam/fillSammAddressingTable.C

applications/utilities/mesh/manipulation/setSet/writeFuns.C

applications/utilities/mesh/manipulation/setSet/writePatch.C

...ations/utilities/mesh/manipulation/setSet/writePointSet.C

...sing/dataConversion/foamToFieldview9/calcFaceAddressing.C

...ssing/dataConversion/foamToFieldview9/fieldviewTopology.C

...ocessing/dataConversion/foamToFieldview9/writeFunctions.C

.../utilities/postProcessing/dataConversion/foamToGMV/itoa.C

...ilities/postProcessing/dataConversion/foamToVTK/vtkMesh.C

...ilities/postProcessing/dataConversion/foamToVTK/vtkTopo.C

...es/postProcessing/dataConversion/foamToVTK/writeFaceSet.C

...tProcessing/dataConversion/foamToVTK/writeFunsTemplates.C

.../postProcessing/dataConversion/foamToVTK/writePatchGeom.C

...cs/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3FoamFields.C

...hics/PV3Readers/PV3FoamReader/vtkPV3Foam/vtkPV3FoamMesh.C