def deregister_rds_db_instance(RdsDbInstanceArn=None):
    """
    Deregisters an Amazon RDS instance.
    See also: AWS API Documentation
    
    
    :example: response = client.deregister_rds_db_instance(
        RdsDbInstanceArn='string'
    )
    
    
    :type RdsDbInstanceArn: string
    :param RdsDbInstanceArn: [REQUIRED]
            The Amazon RDS instance's ARN.
            

    """
    pass
