Unassign a placement group

post https://api.linode.com/{apiVersion}/placement/groups/{groupId}/unassign

Remove one or more compute instances from your placement group.

linode-cli placement unassign-linode 528 \
  --linode 123 456

<https://techdocs.akamai.com/cloud-computing/docs/getting-started-with-the-linode-cli>

linodes:read_write

<https://techdocs.akamai.com/linode-api/reference/get-started#oauth>