You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: rds_list_parameter_groups.go
    path of file: ./repos/aws-doc-sdk-examples/go/example_code/rds
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-Lice
    
func main() {
	// Initialize a session in us-west-2 that the SDK will use to load
	// credentials from the shared credentials file ~/.aws/credentials.
	sess, err := session.NewSession(&aws.Config{
		Region: aws.String("us-west-2")},
	)

	// Create RDS service client
	svc := rds.New(sess)

	result, err := svc.DescribeDBParameterGroups(nil)
	if err != nil {
		exitErrorf("Unable to list parameter groups, %v", err)
	}

	for _, p := range result.DBParameterGroups {
		fmt.Printf("* %s with description: %s\n",
			aws.StringValue(p.DBParameterGroupName), aws.StringValue(p.Description))
	}
}