[TASK] Change example for backend module in BaseScriptClass

Resolves: #60566
Releases: 6.3
Change-Id: I742e68f617dc049ca059406b50e08e24c7d74b79
Reviewed-on: http://review.typo3.org/31811
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>