Log Message:
-----------
Minor editorialization on storage.sgml's documentation of free space
maps.
Modified Files:
--------------
pgsql/doc/src/sgml:
storage.sgml (r1.27 -> r1.28)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/storage.sgml?r1=1.27&r2=1.28)