[BUGFIX] Fix API documentation for sessionTimeout

Show sessionTimeout as integer.

Resolves: #78692
Releases: master
Change-Id: Ia8bb8fa48018a3c9df5791ad8b2081e20f2b0211
Reviewed-on: https://review.typo3.org/50651


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Thomas Mayer <thomas.mayer@2bis10.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>