pgsql: doc: mention data page checksums in WAL section

doc: mention data page checksums in WAL section

Backpatch to 9.3

Adjusted patch from Ian Lawrence Barwick

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/85317e88ccae270ef77bd01c2d3d55a900df2d72

Modified Files
--------------
doc/src/sgml/wal.sgml | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

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