pgsql: Remove sslverify parameter from release notes, mention that

Log Message:
-----------
Remove sslverify parameter from release notes, mention that sslmode is
used instead.

Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.630 -> r1.631)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml?r1=1.630&r2=1.631)