code: func (c *StorageGateway) UpdateSnapshotSchedule(input *UpdateSnapshotScheduleInput) (*UpdateSnapshotScheduleOutput, error) {
  	req, out := c.UpdateSnapshotScheduleRequest(input)
  	return out, req.Send()
  }
docs: // UpdateSnapshotSchedule API operation for AWS Storage Gateway.
  //
  // Updates a snapshot schedule configured for a gateway volume. This operation
  // is only supported in the cached volume and stored volume gateway types.
  //
  // The default snapshot schedule for volume is once every 24 hours, starting
  // at the creation time of the volume. You can use this API to change the snapshot
  // schedule configured for the volume.
  //
  // In the request you must identify the gateway volume whose snapshot schedule
  // you want to update, and the schedule information, including when you want
  // the snapshot to begin on a day and the frequency (in hours) of snapshots.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Storage Gateway's
  // API operation UpdateSnapshotSchedule for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/UpdateSnapshotSchedule