doc: Improve description of data checksums

This partially reverts bcf2667 that got incorrectly merged, and this
improves the wording of the documentation that existed before that.

Per discussion with Justin Pryzby.

Discussion: https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/bd1b8d0ef2eb5f2a8765fbb3b74e0262c9983942

Modified Files
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doc/src/sgml/wal.sgml | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

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