message: correct wal_ttl value
diff: # RPC timeout for raft client (ms)
  --raft_rpc_timeout_ms=500
  ## recycle Raft WAL
  ---wal_ttl=3600
  +--wal_ttl=14400
  ########## Disk ##########
  # Root data path. Split by comma. e.g. --data_path=/disk1/path1/,/disk2/path2/
  