[TASK] Move RST file for adding Kinyarwanda to correct folder

Resolves: #90122
Relates: #90115
Releases: master, 9.5
Change-Id: I418352c212a2626cb584fcda3ba4bef31e7181d4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62917


Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>