links to postscript files in toplevel index page are wrong.

From rxb@sabretooth Wed Mar 1 13:46 PST 1995
Date: Wed, 1 Mar 1995 13:44:47 -0800
From: rxb@sabretooth (Rafael Bracho)
To: fp.liveoak@scndprsn
Subject: Location of PostScript files

The PostScript version of the white papers are mis-referenced
in the main page. They need to refer to the doc subdirectory.

-Rafael

[csw]
the other links to the ps files from the doc/index.html page are fine,
it is only the top level links that are wrong.