pgsql: Add CVS comment for recent commit: Moved page-level

Log Message:
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Add CVS comment for recent commit:

Moved page-level functions from pgstattuple to
contrib/pageinspect.

Modified Files:
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pgsql/contrib/pgstattuple:
README.pgstattuple (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgstattuple/README.pgstattuple.diff?r1=1.10&r2=1.11)