Revert quickbook documentation changes.

Not abandoning them, I'll continue on a branch. There's just no need to do this
on trunk.


[SVN r68490]

tools/quickbook

@@ -1 +1 @@
-Subproject commit fa03c445284481a39ede07ddfd2e1a0a673847e5
+Subproject commit c9b53645857a3fb6236fe93e36460d108e2d7526