To appeal a rejected edit, you could come to Meta, or come to Super User chat and ask in Root Access or Ask a Super User Moderator for advice.
I'd say your edit was fine. It was factual, added something that couldn't stand as an own answer, and – most of all – didn't change the meaning of the post that was edited. The rejection reason says (emphasis mine):
This edit changes too much in the original post; the original meaning or intent of the post would be lost.
This is not the case here. It adds valid details and resources, which is encouraged. An edit would have been "too radical" if it changed a "yes" to a "no", or completely changed the meaning.
Moreover you're the OP of that question, so the threshold is even a little lower here. Maybe the reviewers didn't see that context – partly to blame on the reviewing tools here.
