code: func (c *Redshift) ModifyClusterParameterGroup(input *ModifyClusterParameterGroupInput) (*ClusterParameterGroupNameMessage, error) {
  	req, out := c.ModifyClusterParameterGroupRequest(input)
  	return out, req.Send()
  }
docs: // ModifyClusterParameterGroup API operation for Amazon Redshift.
  //
  // Modifies the parameters of a parameter group.
  //
  // For more information about parameters and parameter groups, go to Amazon
  // Redshift Parameter Groups (https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-parameter-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 ModifyClusterParameterGroup for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeClusterParameterGroupNotFoundFault "ClusterParameterGroupNotFound"
  //   The parameter group name does not refer to an existing parameter group.
  //
  //   * ErrCodeInvalidClusterParameterGroupStateFault "InvalidClusterParameterGroupState"
  //   The cluster parameter group action can not be completed because another task
  //   is in progress that involves the parameter group. Wait a few moments and
  //   try the operation again.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/ModifyClusterParameterGroup