Rewrite Gozag wrath description

Per request.
Pare down a couple of Spider rune vaults.

These were among the earliest vaults I ever created, and with a more
experienced vault design sense and gameplay sense I've come to believe
that they were unnecessarily large and/or ill-balanced.

grunt_spider_rune_circles loses its extraneous outer layer, and is now
ORIENT: float; you can make up for some of the removed chaff with the
additional emperor scorpions in the now-outer layer.

grunt_spider_rune_island now has its originally intended ORIENT: of west
(I'm not sure if this was an initial mistake on my part or if it's
something that was accidentally changed along the way), is now
accessible from three directions, and has some of the large open space
now filled in.

Though grunt_spider_rune_parallel is probably still too large, it's also
considerably different presently than what I originally designed the
vault for, and I haven't yet figured out what, if anything, I want to do
with it, so it's untouched for now. (At present, it also plays
considerably better than my other two endings.)

Really, we could use more Spider endings of the appropriate size -
especially those that leverage some of the more recent additions to the
game.