bad link - Mailing list pgsql-docs

The link to Norm Walsh's style sheets has changed to: http://nwalsh.com/

I hope the following is good enuf for a patch:

-----

$ cvs diff docguide.sgml
Index: docguide.sgml
===================================================================
RCS file: /home/cvs/pgsql/doc/src/sgml/docguide.sgml,v
retrieving revision 1.15
diff -r1.15 docguide.sgml
178c178
<    <ulink url="http://www.berkshire.net/~norm/docbook/dsssl">Modular DocBook Style
sheets</ulink>.
---
>    <ulink url="http://nwalsh.com/">Modular DocBook Stylesheets</ulink>.
$

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Vince.
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