[TASK] Adjust rst syntax for proper yaml and ts highlighting

Use proper code highlighting syntax for yaml and typoscript within 86160
changelog entry.

Resolves: #86160
Releases: master
Change-Id: I791956413885cabdfdf5693e9d0ad6c4be41a29d
Reviewed-on: https://review.typo3.org/58515


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>