[TASK] Fix doc comment in fixture BlogController::processRequest

Fixes the doc comment for processRequest in BlogController by
removing annotations that are already explained by the
method signature.

Resolves: #96694
Releases: main, 11.5
Change-Id: I208fd8d541f9bf863672bc3ee6aca0cc9748186c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73167


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>