The code to apply an automatic annotation to the knox level was looking
for a drawbridge like on the castle level, but knox doesn't have any
drawbridge. Look for its door instead. (It's initially a secret door,
so won't be revealed via magic mapping. It needs to be found or
destroyed to get mapped as a door or empty doorway in order to trigger
the annotation.)
Also, give a tiny bit of variation to the knox level layout. It used
to have both the throne and the secret door on the lower of two similar
rows and the door into the treasure vault on the upper one. Now each
of the three can be on either of those two rows (independently of each
other), making eight possibilities. This doesn't accomplish much,
other than to make the secret door locations not always be at the same
fixed spot.
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