STYLE: Updated header file documentation

applications/solvers/combustion/chemFoam/chemFoam.C

...vers/heatTransfer/chtMultiRegionFoam/chtMultiRegionFoam.C

...ations/solvers/incompressible/boundaryFoam/boundaryFoam.C

.../solvers/lagrangian/coalChemistryFoam/coalChemistryFoam.C

...olvers/lagrangian/reactingParcelFoam/reactingParcelFoam.C

...ng/lagrangian/steadyParticleTracks/steadyParticleTracks.C

...utilities/preProcessing/faceAgglomerate/faceAgglomerate.C

applications/utilities/preProcessing/mapFields/mapFields.C

...s/surface/surfaceBooleanFeatures/surfaceBooleanFeatures.C

applications/utilities/surface/surfaceClean/surfaceClean.C

...cations/utilities/surface/surfaceCoarsen/surfaceCoarsen.C

...cations/utilities/surface/surfaceInertia/surfaceInertia.C

...ies/surface/surfaceRefineRedGreen/surfaceRefineRedGreen.C

...s/surface/surfaceSplitByTopology/surfaceSplitByTopology.C