Improve doxygen help for spectrum component extend above/below API functions. https://tracker.physiomeproject.org/show_bug.cgi?id=3919
Improve doxygen help for spectrum component extend above/below API functions. https://tracker.physiomeproject.org/show_bug.cgi?id=3919

OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc