Small error in documentation (responsive utilities)

Created by: KrisGielen

Unless I don't understand how it works, I think there is a small error in the one but last paragraph of https://github.com/twbs/bootstrap/blob/v4-dev/docs/4.0/migration.md#responsive-utilities It states:

You can combine one .d--none class with one .d--block class to show an element only on a given interval of screen sizes (e.g. .d-none.d-md-block.d-lg-none shows the element only on medium and large devices).

However, I think it should read:

You can combine one .d--none class with one .d--block class to show an element only on a given interval of screen sizes (e.g. .d-none.d-md-block.d-xl-none shows the element only on medium and large devices).