One of my team members spotted an error in a single question he created, after submission but before an editor could look into it. Could my team member already send a correction notice?

I misread the question... Looking again at the submission page.

It doesn't look like there's a way to submit a correction while the question is in the queue for editing. If it's a small error like a typo the editor will likely fix it before the question goes online.

If it's a factual error, or a typo that was missed, or if you just wish to make a change to a question, you can either wait until the question is accepted and then submit a correction from the "My Contributions - All Accepted Submissions" page, or you can contact an editor in the category you submitted the question and ask him/her to make the change.

I'd definitely try contacting an editor in the category. Might not catch it before someone else puts it online, but it's worth a try.