STYLE: remove debugging print out, fix doc category

Remove a qDebug call that is just informational about
the system settings for the markups.
Change the documentation category to Informatics.

Issue #2740



git-svn-id: http://svn.slicer.org/Slicer4/trunk@22340 3bd1e089-480b-0410-8dfb-8563597acbee