In one of my recent answers I made a mistake, which was later corrected and I am thankful, that I don't have to do this myself. In this edit there was at the end the statement
edit: updated equation
included (link). I don't find this helpful at all, since chances are that future visitors don't have seen the original post and why should they care what happened in between.
I have seen a couple of other posts, questions and answers, where such statements are included. In most cases there is an addendum to the original post, lead in with Edit, sometimes more than one occurrence. I don't see how this provides anything to the post. If someone is interested in the history of the post, it can be looked up. I think a post should be standalone, meaning it should include all relevant information at once and it should read like it.
I would suggest keeping (especially questions) free of such noisy statements.