Unassign storage policy

curl -i -X DELETE "https://api.box.com/2.0/storage_policy_assignments/932483" \
     -H "Authorization: Bearer <ACCESS_TOKEN>" \
     -d '{
       "items": {
         "type": "storage_policy",
         "id": "1434325"
       }
     }'

BoxStoragePolicyAssignment assignment = new BoxStoragePolicyAssignment(api, "dXNlcl8xMjM0");
assignment.delete();

client.storage_policy_assignment(assignment_id='12345').delete()
print('The storage policy assignment was successfully delete!')

client.storagePolicies.removeAssignment('dXNlcl8yMjIyMg==')
    .then(() => {
        // deletion succeeded — no value returned
    });

client.storagePolicies.deleteAssignment(storagePolicyAssignmentId: "22222") { result: Result<Void, BoxSDKError>} in
    guard case .success = result else {
        print("Error deleting storage policy assignment")
        return
    }
    print("Storage policy assignment is successfully deleted.")
}