doc: Remove dead links

Peter Eisentraut <peter_e@gmx.net>

Commit: c193b8ca9d05e8167b6deb057c06a7580fa517a3
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2015-09-13T03:49:11Z
Releases: 9.6.0
doc: Remove dead links

The web pages of Andy Dong at Berkeley don't exist anymore, and he is no
longer there.

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PathChange+/−
doc/src/sgml/cube.sgml modified +1 −4

Documentation touched