Use lookup to find DeclFileLine() and thus the class comment.


git-svn-id: https://root.cern.ch/svn/root/trunk@49104 27541ba8-7e3a-0410-8455-c3a389f83636
Add documentation!


git-svn-id: https://root.cern.ch/svn/root/trunk@49105 27541ba8-7e3a-0410-8455-c3a389f83636