What are reasons why people list their edits on posts or comments?

I get it if you changed something altogether, but just to correct something seems a little mundane (i.e., “edit: added a letter” or “edit: typo”). And I’m genuinely asking, because as far as I can tell there isn’t even a way to see that a post or comment has been edited (like on Facebook). Unless the web version shows this (I always use the app).

Anyway, just genuinely curious. Thanks πŸ™‚