Log Message:
-----------
Update URL to Docbook DSSSL stylesheets, per Gabriele Bartolini.
Modified Files:
--------------
pgsql/doc/src/sgml:
docguide.sgml (r1.73 -> r1.74)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/docguide.sgml?r1=1.73&r2=1.74)