code: func (c *Redshift) ModifySnapshotSchedule(input *ModifySnapshotScheduleInput) (*ModifySnapshotScheduleOutput, error) {
  	req, out := c.ModifySnapshotScheduleRequest(input)
  	return out, req.Send()
  }
docs: // ModifySnapshotSchedule API operation for Amazon Redshift.
  //
  // Modifies a snapshot schedule. Any schedule associated with a cluster is modified
  // asynchronously.
  //
  // 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 Amazon Redshift's
  // API operation ModifySnapshotSchedule for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidScheduleFault "InvalidSchedule"
  //   The schedule you submitted isn't valid.
  //
  //   * ErrCodeSnapshotScheduleNotFoundFault "SnapshotScheduleNotFound"
  //   We could not find the specified snapshot schedule.
  //
  //   * ErrCodeSnapshotScheduleUpdateInProgressFault "SnapshotScheduleUpdateInProgress"
  //   The specified snapshot schedule is already being updated.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/ModifySnapshotSchedule