pgsql: Update high availability/replication documentation chart for new

Log Message:
-----------
Update high availability/replication documentation chart for new hot
standby featureset.

Modified Files:
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pgsql/doc/src/sgml:
high-availability.sgml (r1.38 -> r1.39)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/high-availability.sgml?r1=1.38&r2=1.39)