To the best of my knowledge, GitHub org and usernames in the URI are case-insensitive for both the website and clone URIs. I haven't tested ssh clone URIs to know if they are also insensitive, but I'd guess they are
You would only need to change it if the "presentation" format bothers you (again, as far as I know)
You would only need to change it if the "presentation" format bothers you (again, as far as I know)