Log Message:
-----------
Add comment noting that hashm_procid in a hash index's metapage isn't
actually used for anything.
Modified Files:
--------------
pgsql/src/backend/access/hash:
hashpage.c (r1.63 -> r1.64)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/hash/hashpage.c.diff?r1=1.63&r2=1.64)