It'd be more helpful for edits to be appended to a comment, allowing context of the conversation to still make sense.

Misinformation is also going to be much overused and meaningless if used for situations like a simple mistake. The commenter just misread something - branding it as misinformation seems to imply intent, otherwise why wouldn't you just call it a mistake?

Honestly I disagree, edits are for spelling and wording. It's important to not edit the content of comments, so that follow up comments and their context remain the same.