Figure 8 in properties.tex should have type wh-interrogative

[stefan11]

The type in the figure is hd-filler-phrase but should be a subtype wh-interrogative introduced later.

Bob:

I’m inclined to leave Figure 8 as it is, especially as we say “Figure 8 illustrates a typical head-filler phrase” and we haven’t yet introduced any subtypes of head-filler-phrase. Of course any head-filler-phrase will be an instance of some subtype, but I don’t think this needs to be said. I suppose we might add some sort of footnote about this, but I don’t think it’s really necessary.