docs: func (c *Redshift) ModifySnapshotCopyRetentionPeriod(input *ModifySnapshotCopyRetentionPeriodInput) (*ModifySnapshotCopyRetentionPeriodOutput, error) {
  	req, out := c.ModifySnapshotCopyRetentionPeriodRequest(input)
  	return out, req.Send()
  }