STYLE: Add missing comment from SuperBuild extension template

git-svn-id: http://svn.slicer.org/Slicer4/trunk@27542 3bd1e089-480b-0410-8dfb-8563597acbee

Extensions/Testing/SuperBuildExtensionTemplate/SuperBuild.cmake

@@ -10,6 +10,7 @@ set(ep_common_cxx_flags "${CMAKE_CXX_FLAGS_INIT} ${ADDITIONAL_CXX_FLAGS}")
 # Top-level "external" project
 #-----------------------------------------------------------------------------
 
+# Extension dependencies
 foreach(dep ${EXTENSION_DEPENDS})
   mark_as_superbuild(${dep}_DIR)
 endforeach()

Utilities/Templates/Extensions/SuperBuild/SuperBuild.cmake

@@ -10,6 +10,7 @@ set(ep_common_cxx_flags "${CMAKE_CXX_FLAGS_INIT} ${ADDITIONAL_CXX_FLAGS}")
 # Top-level "external" project
 #-----------------------------------------------------------------------------
 
+# Extension dependencies
 foreach(dep ${EXTENSION_DEPENDS})
   mark_as_superbuild(${dep}_DIR)
 endforeach()