def self_service_dislay_name=(new_val)
      new_val.strip!
      return nil if @self_service_dislay_name == new_val
      raise JSS::InvalidDataError, 'Only macOS Self Service items have display names' unless self_service_targets.include? :macos
      @self_service_dislay_name = new_val
      @need_to_update = true
    end
def self_service_dislay_name=(new_val)
      new_val.strip!
      return nil if @self_service_dislay_name == new_val
      raise JSS::InvalidDataError, 'Only macOS Self Service items have display names' unless self_service_targets.include? :macos
      @self_service_dislay_name = new_val
      @need_to_update = true
    end
@param new_val[String] The display name of the item in SSvc

 @return [void]