[DOCS] Streamline Symfony Command examples

* Namespace should be "Command"
* Removed superfluous comma

Resolves: #92233
Releases: master, 10.4
Change-Id: I6bcdeb0528ef6d1fc3d6f129572f18b7979d7fe5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65642


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>