I think it's a funny little app. I could see it being kind of useful for the author but I think I would personally have trouble using an app that I don't actually know what it's going to do 100%. I think that you could mitigate this a bit by putting the list of commands it corrects right at the top of the readme.

I think most of us have probably been at the point where we were typing something like "I hate you, you god damn computer!" into the terminal or text editor. I see this as a moderately elegant helper in those situations