Update dcos-minuteman references
Description
The Navstar systemd service now (1.9) manages the Minuteman process. So dcos-minuteman.service no longer exists.
The documentation needs updating to reflect this.
https://github.com/dcos/dcos/search?q=dcos-minuteman
https://github.com/dcos/dcos-docs/search?q=dcos-minuteman
https://github.com/mesosphere/dcos-docs-enterprise/search?q=dcos-minuteman
Other places?
Do we need to change any docs text as well, like calling Minuteman a logical component in the component architecture overview?