What was wrong with this edit? It seemed like a straightforward one...
Looks like what happened is that the current author of the 2nd revision opted to "improve" your edit and unchecked the "suggested edit was helpful" checkbox on that page.
The quotes around
So, good news: you did nothing wrong that I can see. I would've approved your edit as well.
Bad news: there's nothing we can do about the rejected edit beyond just making the changes that were lost as the result again (which I'm about to do).