Fix typo

Author: OmSaran

scripts/ycsb_rocksdb/README.md

@@ -1,6 +1,6 @@
 To run ycsb benchmarks on SplitFS:
 1. [Setup SplitFS](https://github.com/utsaslab/SplitFS#set-up-ext4-DAX)
-2. Compile SplitFS with desired mode (posix, sync, strict). Be sure to set the `WORKLOAD_ROCKSDB` and `WORKLOAD_YCSB` flags
+2. Compile SplitFS with desired mode (posix, sync, strict). Be sure to set the `LEDGER_ROCKSDB` and `LEDGER_YCSB` flags
 3. `cd scripts/ycsb_rocksdb`
 4. `./run_ycsb_rocksdb.sh`
 5. `cd ../../`