TrkExAlgs → DetectorDescription Relation

File in Tracking/TrkExtrapolation/TrkExAlgs/TrkExAlgs	Includes file in DetectorDescription
ExtrapolationValidation.h	GeoPrimitives / GeoPrimitives / GeoPrimitivesHelpers.h
RiddersAlgorithm.h	GeoPrimitives / GeoPrimitives / GeoPrimitives.h