docs: Add RocksDB option config doc (#3526)
docs: Add RocksDB option config doc (#3526)

Signed-off-by: CaitinChen <08e745b554256eb60b8777ebefd27041b21088fb@pingcap.com>
pingcap/tikv,pingcap/tikv,c4pt0r/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv