I'm in favour of this idea in theory, but I feel that an active notification would be too noisy and might come across as the system nagging you to rescind your down-vote even for the most trivial of edits.
What might be a better solution could be to present the user withhave a page/tab on theiryour own profile that lists the posts edited since you cast your vote(s).
You could then choose to look at this information or not, and then act on it or not. There would be no nagging from the system, no noisy inbox, just the the data for you to use or ignore.