[DOCS] Fix section on how to open the dashboard

Replace the todo with information. Thanks at Florian Weiss for pointing this
out and providing me with the screenshot

Releases: main, 11.5
Resolves: #98215
Change-Id: Ia14e18ecd260ee9dfa98dae88aa68e8e7b4f1612
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75572


Tested-by: Lina Wolf <112@linawolf.de>
Reviewed-by: Lina Wolf <112@linawolf.de>