[DOCS] Document "Restrict export functionality"

Add changelog entry to https://review.typo3.org/c/Packages/TYPO3.CMS/+/74902 - Restrict export functionality to allowed users

Resolves: #97771
Releases: main, 11.5, 10.4
Change-Id: I98252b73aa5b14a8cfe5d26559711123e17ced15
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74977
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
162 jobs for 10.4 in 11 minutes and 48 seconds (queued for 51 seconds)