Correct doxygen comments (#1459)

Core/FormFactors/FormFactorAnisoPyramid.cpp

Core/FormFactors/FormFactorCone.cpp

Core/FormFactors/FormFactorCone.h

Core/FormFactors/IFormFactor.h

Core/Samples/Crystal.cpp

Core/Samples/Crystal.h

Core/Samples/IClusteredParticles.h

Core/Tools/Histogram1D.cpp

Doc/Doxygen/Doxyfile

Wrap/swig/DoxyfileSwig.in

auto/Wrap/doxygen_core.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp

auto/Wrap/libBornAgainCore_wrap.h