This redirects to the home page of "get docker": https://www.docker.com/products/docker-toolbox, so it's 404 I guess. AFAICT this is an appropriate replacement: https://www.docker.com/docker-windows
I would send a PR but I didn't see right away out how to do that for the Wiki text (where's the markdown source?)
EDIT: Oh... this workaround for Wiki PRs shows how to get the .md but still a painful workaround for the PR.