Spell out what "LW Types" stands for

There is a GUI frame labled "LW Types" and I think we have plenty of space to spell out what it stand for. To see it:

1. Rclick the current screen you are editing
2. click 'Edit Combo' in the context menu
3. In the Combo Editor, select the Triggers tab
4. Select the Weapons tab, and lo and behold the "LW Types" frame appears

What are they? Link weapons? Level weapons? One fewer question for novice questmakers if we spell it out.

This "LW Types" frame is created by ComboEditorDialog::view() in comboeditor.cpp