doc: update the default of data checksums in the doc of pg_rewind

Zhijie Hou (Fujitsu) <houzj.fnst@fujitsu.com>

From: "Zhijie Hou (Fujitsu)" <houzj.fnst@fujitsu.com>
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-12-24T07:27:50Z
Lists: pgsql-hackers

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Hi,

I noticed that the pg_rewind documentation still states that data
checksums is disabled by default, but it has been changed to on since PG18.

Here's a small patch to update this.

Best Regards,
Hou zj