DOC: Use explicit ImageIO argument to itk_generate_factory_registration()

Also make sure to use ITKImageIO for the find_package COMPONENT.

Author: thewtex

SoftwareGuide/Latex/Introduction/Installation.tex

@@ -632,10 +632,9 @@ \section{Using ITK as an External Library}%
   COMPONENTS
     MorphologicalContourInterpolation
     ITKSmoothing
-    ITKIOImageBase
-    ITKIONRRD
+    ITKImageIO
     )
-itk_generate_factory_registration()
+itk_generate_factory_registration(ImageIO)
 
 add_executable(Example Example.cxx)
 target_link_libraries(Example ${ITK_INTERFACE_LIBRARIES} ITK::ITKImageIO)