Returns a list of DBSubnetGroup descriptions. If a DBSubnetGroupName is specified, the list will contain only the descriptions of the specified DBSubnetGroup.
DBSubnetGroupName: The name of the subnet group to return details for.
Filters: This parameter is not currently supported.
MaxRecords: The maximum number of records to include in the response. If more records exist than the specified MaxRecords value, a pagination token (marker) is included in the response so that the remaining results can be retrieved.
Default: 100
Constraints: Minimum 20, maximum 100.
Marker: An optional pagination token provided by a previous request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by MaxRecords.