Fix typo in rocksdb options file

Author: ls4154

rocksdb/options.ini

@@ -22,7 +22,7 @@
   two_write_queues=false
   bytes_per_sync=0
   writable_file_max_buffer_size=1048576
-  wal_dir=/tmp/ycsb-rocskdb
+  wal_dir=/tmp/ycsb-rocksdb
   log_file_time_to_roll=0
   keep_log_file_num=1000
   WAL_ttl_seconds=0