BUG: Fixed spelling mistake

Author: aylward

SoftwareGuide/Latex/Architecture/SpatialObjects.tex

@@ -152,7 +152,7 @@ \subsection{TubeSpatialObject}
 to be used to represent vascular networks extracted from 2D and 3D images. 
 It can also be used to represent airways, nerves, bile ducts, and more.
 
- The class \doxygen{DTITubeSpatialObject} is derive from this class
+ The class \doxygen{DTITubeSpatialObject} is derived from this class
 and adds constructs for representing fiber tracts from diffusion tensor images.
 
 \label{sec:TubeSpatialObject}