post https://api.linode.com//placement/groups//unassign
Remove one or more compute instances from your placement group.
linode-cli placement unassign-linode 528 \
--linode 123 456
<https://www.linode.com/docs/products/tools/cli/get-started/>
linodes:read_write
<https://techdocs.akamai.com/linode-api/reference/get-started#oauth>