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Yes, when I was completely wrong and someone else corrected me in a reply. It's happened a handful of times. I don't like to delete comments.
I think in that case I’d probably add an update to the comment. But downvoting yourself feels really honest somehow
Oh, I edit with a strikethrough or correction as needed. But that's what downvotes are for, reducing the impact of irrelevant content.
But other people might make similar incorrect comments, better that your comment with the reply that makes a correction float to the top (for people who sort by upvotes). The best solution is probably editing if you have the time and upvoting the reply. Similarly I'll upvote something incorrect if I reply to it but downvote if I don't have the time to reply.
I edit my comment, but still keep the original wrong one in the edit. I want to admit what I did wrong.