[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/+/74920


Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Chris Müller <typo3@krue.ml>
Tested-by: Nikita Hovratov <nikita.h@live.de>