[CLEANUP] Fix various spelling mistakes

Resolves: #53793
Releases: 6.2
Change-Id: Iefe8a2a96f41903ca33b02da4aace71690951cbf
Reviewed-on: https://review.typo3.org/25530
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Oliver Klee
Reviewed-by: Markus Klein
Tested-by: Markus Klein