[CLEANUP] Alwas put null at the last position

This patch applies the phpdoc_types_order rule of the
php-cs-fixer. See http://cs.sensiolabs.org/ -> phpdoc_types_order

Releases: master, 8.7
Resolves: #83109
Change-Id: I57291fb0b113ad01e2a171c1cfd6a9943d6302ad
Reviewed-on: https://review.typo3.org/54779


Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>