[BUGFIX] Corrects link to Extbase documentation

Replaces old TYPO3 Forge link regarding skip default
arguments feature in Extbase to TYPO3 Wiki.

Resolves: #75909
Releases: master
Change-Id: If4d6cce26c22d296af3404c283a39b6851314394
Reviewed-on: https://review.typo3.org/48105


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>