Docs feedback: Links to Docker Machine documentation are out of date

On the page Install and register GitLab Runner for autoscaling with Docker Machine, the section on Verifying Docker Machine options contains a link to the Docker Machine documentation on how to set up Google Compute Engine driver credentials - which is no longer there since Docker discontinued Docker Machine.

As a user I should be able to find this information on GitLab's documentation, since GitLab is now maintaining their own fork of Docker Machine for use in autoscaling GitLab Runners.