[TASK] Update styling of sys notes

Resolves: #70064
Releases: master
Change-Id: I875c2a8031550a4fcbc7b1dc73ed6d4a78e4687e
Reviewed-on: http://review.typo3.org/43510


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>