Remove comma from weight system notes

What does this MR do?

Removes the comma from weight system notes, as a dot was added here to all of the system notes

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18864

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Conform by the code review guidelines
  • Has been reviewed by a Backend maintainer
• Conform by the merge request performance guides
• Conform by the style guides

closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6372