leveldb: fix incorrect comments on OpenFile func
leveldb: fix incorrect comments on OpenFile func

syndtr/goleveldb,FactomProject/goleveldb,conseweb/goleveldb,trigrass2/goleveldb,btcsuite/goleveldb,hustbill/goleveldb,no2key/goleveldb,chai2010/goleveldb,zzl0/goleveldb,rentongzhang/goleveldb,ngaut/goleveldb