Log Message:
-----------
Update obsolete URL, per Chris.
Modified Files:
--------------
pgsql/doc/src/sgml:
gist.sgml (r1.22 -> r1.23)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/gist.sgml.diff?r1=1.22&r2=1.23)
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