Missing documentation for CAPO

[snecklifter]

Which section(s) is the issue in?

https://docs.openshift.com/container-platform/4.15/machine_management/capi-machine-management.html

What needs fixing?

CAPO is now included as Tech Preview as per https://docs.openshift.com/container-platform/4.15/release_notes/ocp-4-15-release-notes.html#ocp-4-15-installation-and-update

This needs adding to the CAPI machine management page with some examples.

[openshift-bot]

Issues go stale after 90d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle stale