code: func (c *Client) UpdateCloudIP(updateCloudIP *CloudIPOptions) (*CloudIP, error) {
  	cip := new(CloudIP)
  	_, err := c.MakeApiRequest("PUT", "/1.0/cloud_ips/"+updateCloudIP.Id, updateCloudIP, &cip)
  	if err != nil {
  		return nil, err
  	}
  	return cip, nil
  }
docs: // UpdateCloudIP updates an existing cloud ip's attributes. Not all attributes
  // can be changed after creation time (such as Id, which is allocated for you).
  //
  // Specify the cloud ip you want to update using the CloudIPOptions Id field