code: func expandCustomizationGlobalIPSettings(d *schema.ResourceData) types.CustomizationGlobalIPSettings {
  	obj := types.CustomizationGlobalIPSettings{
  		DnsSuffixList: structure.SliceInterfacesToStrings(d.Get(cKeyPrefix + "." + "dns_suffix_list").([]interface{})),
  		DnsServerList: structure.SliceInterfacesToStrings(d.Get(cKeyPrefix + "." + "dns_server_list").([]interface{})),
  	}
  	return obj
  }
docs: // expandCustomizationGlobalIPSettings reads certain ResourceData keys and
  // returns a CustomizationGlobalIPSettings.