Instagram has announced a new feature that finally lets users edit comments after posting, with the caveat that users only have a 15-minute window to do so. After that, they cannot edit their comments.Another catch is you can only edit the text in the comments, so, for instance, if a comment has both text and a photo, you can only edit the text.Instagram users now can edit comments after postingHowever, on the plus side, there's no limit to the number of times you can edit a comment on Instagram within 15 minutes of posting it. But it's worth noting that once a comment is...