code: func (c *Redshift) RevokeClusterSecurityGroupIngress(input *RevokeClusterSecurityGroupIngressInput) (*RevokeClusterSecurityGroupIngressOutput, error) {
  	req, out := c.RevokeClusterSecurityGroupIngressRequest(input)
  	return out, req.Send()
  }
docs: // RevokeClusterSecurityGroupIngress API operation for Amazon Redshift.
  //
  // Revokes an ingress rule in an Amazon Redshift security group for a previously
  // authorized IP range or Amazon EC2 security group. To add an ingress rule,
  // see AuthorizeClusterSecurityGroupIngress. For information about managing
  // security groups, go to Amazon Redshift Cluster Security Groups (https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-security-groups.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 RevokeClusterSecurityGroupIngress for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeClusterSecurityGroupNotFoundFault "ClusterSecurityGroupNotFound"
  //   The cluster security group name does not refer to an existing cluster security
  //   group.
  //
  //   * ErrCodeAuthorizationNotFoundFault "AuthorizationNotFound"
  //   The specified CIDR IP range or EC2 security group is not authorized for the
  //   specified cluster security group.
  //
  //   * ErrCodeInvalidClusterSecurityGroupStateFault "InvalidClusterSecurityGroupState"
  //   The state of the cluster security group is not available.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/RevokeClusterSecurityGroupIngress