DOC: removing redundant reference to other functors

Examples/Radiometry/NDVIRAndNIRVegetationIndexImageFilter.cxx

@@ -116,9 +116,6 @@ int main( int argc, char *argv[] )
   // the images pixel type as template parameters. It is
   // implemented as a functor class which will be passed as a
   // parameter to an \doxygen{otb}{RAndNIRVegetationIndexImageFilter}.
-  // Note that we also can use other functors which operate with the 
-  // Red and Nir channels, such as PVI, RVI, SAVI, MSAVI, TSAVI, GEMI,
-  // WDVI, IPVI, and TNDVI.
   //
   //  Software Guide : EndLatex