[TASK] Make .htaccess Apache 2.4 suitable

This patch makes EXT:documentation/Resources/Private/.htaccess and
EXT:extbase/Resources/Private/.htaccess Apache 2.4 suitable

Resolves: #76066
Resolves: #76064
Releases: master, 7.6, 6.2
Change-Id: I91c6e683eeb1bc92e1192d2b3800d2dcb8a9d4b9
Reviewed-on: https://review.typo3.org/48023


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>