feat: update DC/OS CLI installation link to latest.
feat: update DC/OS CLI installation link to latest.

The new DC/OS CLI is designed to work for any version of DC/OS >= 1.10.
We can thus safely use the latest release for the current and upcoming
versions of DC/OS.

Closes DCOS-40900

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui