code: func (c *Redshift) DescribeClusterVersions(input *DescribeClusterVersionsInput) (*DescribeClusterVersionsOutput, error) {
  	req, out := c.DescribeClusterVersionsRequest(input)
  	return out, req.Send()
  }
docs: // DescribeClusterVersions API operation for Amazon Redshift.
  //
  // Returns descriptions of the available Amazon Redshift cluster versions. You
  // can call this operation even before creating any clusters to learn more about
  // the Amazon Redshift versions. For more information about managing clusters,
  // go to Amazon Redshift Clusters (https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-clusters.html)
  // in the Amazon Redshift Cluster Management Guide.
  //
  // 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 DescribeClusterVersions for usage and error information.
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DescribeClusterVersions