[DOCS] Fix formatting in .rst files

Lists must always be preceeded and followed by a newline. Otherwise
they will not get rendered correctly.

Resolves: #90805
Releases: master, 9.5, 8.7
Change-Id: I558e486ef556be41bb27873af8d0d67a448064f4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63837


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Haupt <mail@danielhaupt.de>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Haupt <mail@danielhaupt.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>