[DOCS] Correct examples around getTSFE() in changelogs

Resolves: #100672
Related: #100563
Related: #100586
Releases: main
Change-Id: Ifda318b1e86232b040d8d84d58dcc7ea47fcd709
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78756


Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>