This question already has an answer here:
Could you guys add a feature to unflag a post? It would be nice to see a list of what you have flagged as, and to be able to remove individual flags.
I know this has happened to many people: The post requires a flag (which like a good citizen you provide) and an hour later the OP edits to fix it. Moderators come along and don't like your flag. Nowhere is there an option to remove a flag after a post has been fixed.
It would also be nice to see who else flags a post and what they flagged it as.