[DOCS] Fix code formatting in changelog for generating Fluid schema

Resolves: #104616
Related: #104114
Releases: main
Change-Id: Ia2731c55d14e7d0912caa9724239eb041fa2a58e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85621


Tested-by: Simon Praetorius <simon@praetorius.me>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Simon Praetorius <simon@praetorius.me>
Tested-by: Garvin Hicking <gh@faktor-e.de>