Update getting started for Docker Dashboard (#12369)
Update getting started for Docker Dashboard (#12369)

* Update getting started for Docker Dashboard

Update getting started for Docker Dashboard to explicitly specify that it's available for Mac and Windows.

* Minor update

Co-authored-by: Usha Mandya <63fc8324d194bb900191b7ad7215ea10fd135fb2@users.noreply.github.com>
docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io