doc: Mention online checksum enabling in pg_checksums docs

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 4ae3e98c02cf57ba5e1d29e914a3b2e4d15f066f
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2026-06-04T22:12:33Z
doc:  Mention online checksum enabling in pg_checksums docs

The documentation for bin/pg_checksums refered to online processing only
in passing, this extends the documentation to list online checksums as as
alternative as well as providing a link to the new Data Checksums section.

Author: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Bruce Momjian <bruce@momjian.us>
Reported-by: Bruce Momjian <bruce@momjian.us>
Discussion: https://postgr.es/m/aiHKJWa1k28fFTqf@momjian.us

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PathChange+/−
doc/src/sgml/ref/pg_checksums.sgml modified +10 −5
doc/src/sgml/wal.sgml modified +1 −1

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