Some users are aware that they can edit their answers after they're deleted by moderators.
However, they cannot vote to undelete such answers. Furthermore, they seem to be unaware they can flag their answers for a moderator's review. Often, with the realization that they can't reinstate their answers themselves, many of these users even proceed to repost the edit as a new answer, which is counter-productive and a waste of everyone's time, not to mention it adds unnecessary duplication and noise for users who can see deleted answers.
It would be nice for the system to somehow let users know that they can flag their deleted answers for undeletion after editing them, maybe with a popup or something, post-edit. The "flag" link is there, but it's not obvious that clicking it is the next logical step to restoring an answer.