Log Message:-----------Update HOT README about when single-page vacuums happen.
Modified Files:-------------- pgsql/src/backend/access/heap: README.HOT (r1.6 -> r1.7) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/heap/README.HOT?r1=1.6&r2=1.7)
