Bug 27947: (follow-up) Improve atomic update

Bug 27947: (follow-up) Improve atomic update

We do not need to replace the whole notice text, we only need to
replace the reference to article_requests.notes.

Test plan:
Run the dbrev. Verify result for notice AR_CANCELED.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>