Improve comments in online checksums code

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: cd857dec0e0ae63dabf548d51fddb27c45561086
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2026-05-29T19:26:21Z
Improve comments in online checksums code

Spelling fixes and rewording outdated information.

Author: Tomas Vondra <tomas@vondra.me>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/f1281cf3-89a3-4936-9bc5-2a5a6291229f@vondra.me

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