You can use any of these as an Inline Policy for specific users or groups, or you can create this as a Managed Policy within AWS, which can be attached to users, groups and roles.
This next policy is very similar, but leverages a special tag "parkmycloud:yes" to grant permissions to park instances. (Of course you can substitute any tag key:value pair you prefer, instead.) If the instance does not have the specified tag, then the user will NOT be allowed to park the instance.
PLEASE NOTE: This tag only constrains ec2 instances. It does NOT restrict updating of autoscaling groups.