ENH : improve SARPol latex description

...Polarimetry/otbMuellerToCircularPolarisationImageFilter.h

Code/SARPolarimetry/otbMuellerToCovarianceImageFilter.h

...metry/otbMuellerToPolarisationDegreeAndPowerImageFilter.h

...Polarimetry/otbMultiChannelsPolarimetricSynthesisFilter.h

Code/SARPolarimetry/otbPolarimetricSynthesisFilter.h

...RPolarimetry/otbReciprocalCoherencyToMuellerImageFilter.h

...otbReciprocalCovarianceToReciprocalCoherencyImageFilter.h

...nearCovarianceToReciprocalCircularCovarianceImageFilter.h

Code/SARPolarimetry/otbSinclairImageFilter.h

...olarimetry/otbSinclairToCircularCovarianceMatrixFunctor.h

Code/SARPolarimetry/otbSinclairToCoherencyMatrixFunctor.h

Code/SARPolarimetry/otbSinclairToCovarianceMatrixFunctor.h

Code/SARPolarimetry/otbSinclairToMuellerMatrixFunctor.h

.../otbSinclairToReciprocalCircularCovarianceMatrixFunctor.h

...larimetry/otbSinclairToReciprocalCoherencyMatrixFunctor.h

...arimetry/otbSinclairToReciprocalCovarianceMatrixFunctor.h