[TASK] Fix example of adding custom table to create database record reactions

fixes error introduced by
https://review.typo3.org/c/Packages/TYPO3.CMS/+/83080

Releases: main, 12.4
Resolves: #103191
Related: #103181
Change-Id: I4636c5c0f39beff6824ec7fb967993087c2fdbc5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83116


Tested-by: Chris Müller <typo3@krue.ml>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>