docs: update page format to specify page checksum field

Bruce Momjian <bruce@momjian.us>

Commit: 57282cdedaa64c0db451a6e05884a76195f21f0c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-11-19T21:54:42Z
Releases: 9.3.2
docs:  update page format to specify page checksum field

Backpatch to 9.3

Per report from Steffen Hildebrandt

Files

PathChange+/−
doc/src/sgml/storage.sgml modified +2 −2