DOC: Remove refs to hybrid segmentation methods (patent issues).

Remove the references to hybrid segmentation methods from the
`Contrbutors` section.

The hybrid segmentation methods (namely the
`itk::SimpleFuzzyConnectedness*` filters and also possibly
`itk::VectorFuzzyConnectednessImageFilter`) were ruled out from ITK due
to patent issues as of ITKv4.

The commit that removed them:
InsightSoftwareConsortium/ITK@6a61bb8

The ITKv4 release notes that notified about it:
https://itk.org/Wiki/ITK/Release_4/Removed_or_renamed_classes
and
https://itk.org/Wiki/ITK_Release_4/Migration_Plan/Release_Notes/ITKv4_Final_Release_Notes
and
https://itk.org/Wiki/ITK/Release_4/Migration_Plan/Release_Notes

Author: Jon Haitz Legarreta

SoftwareGuide/Latex/04-Contributors.tex

@@ -51,11 +51,6 @@ \chapter*{Contributors}
 {\bf Tessa Sundaram} contributed the section on deformable registration using
 the finite element method.
 
-{\bf YinPeng Jin} contributed the examples on  hybrid segmentation methods.
-
-{\bf Celina Imielinska} authored the section describing the principles of
-hybrid segmentation methods.
-
 {\bf Mark Foskey} contributed the examples on the
 AutomaticTopologyMeshSource class.