DOC: TerminationValue and note on early termination
DOC: TerminationValue and note on early termination


Even though ArrivalFunctionToPathFilter is mentioned, the importance of its TerminationValue 
should be stretched even in the  docs of itkSpeedFunctionToPathFilter.
Furthermore, it might help others to note that the path finding can end earlier than expected.
thewtex/ITKMinimalPathExtraction,thewtex/ITKMinimalPathExtraction,thewtex/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction,InsightSoftwareConsortium/ITKMinimalPathExtraction