LCL: doc about TListBox.ItemHeight

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39934 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: doc about TTreeView.DefaultItwmHeight

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39935 4005530d-fff6-0310-9dd1-cebe43e6787f