Doxygen will implicitly pick up these references. Adding them explicitly
causes warnings in the Python wrapping, when their definition is not
available. Remove them also makes it a little easier to read the
comment.
To address:
/home/matt/src/ITK2/Modules/Core/Common/include/itkFloatingPointExceptions.h:50: warning: @copydetails or @copydoc target 'Enable' not found
/home/matt/src/ITK2/Modules/Core/Common/include/itkFloatingPointExceptions.h:61: warning: @copydetails or @copydoc target 'Enable' not found
[5864/6441] Building CXX object Wrapping/Modules/ITKColormap/CMakeFiles/ITKColormapPython.dir/itkScalarToRGBColormapImageFilterPython.cpp.o
/home/matt/src/ITK2/Modules/Filtering/FFT/include/itkForwardFFTImageFilter.h:44: warning: unable to resolve reference to `FrequencyFFTLayoutImageRegionConstIteratorWithIndex' for \ref command
/home/matt/src/ITK2/Modules/Filtering/FFT/include/itkForwardFFTImageFilter.h:46: warning: unable to resolve reference to `ITKImageFrequency' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:38: warning: unable to resolve reference to `FrequencyImageRegionIteratorWithIndex' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:42: warning: unable to resolve reference to `ForwardFFTImageFilter' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:43: warning: unable to resolve reference to `FrequencyFFTLayoutImageRegionIteratorWithIndex' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:44: warning: unable to resolve reference to `FrequencyFFTLayoutImageRegionIteratorWithIndex' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:48: warning: unable to resolve reference to `FrequencyHalfHermitianFFTLayoutImageRegionIteratorWithIndex' for \ref command
/home/matt/src/ITK2/Modules/Filtering/ImageFrequency/include/itkUnaryFrequencyDomainFilter.h:50: warning: unable to resolve reference to `FrequencyShiftedFFTLayoutImageRegionIteratorWithIndex' for \ref command