message: Add description for config max-cache-files
diff: @@ -113,7 +113,7 @@ compression : snappy
  max-background-flushes : 1
  # max-background-compactions: default is 2, limited in [1, 8]
  max-background-compactions : 2
  -# max-cache-files default is 5000
  +# maximum value of Rocksdb cached open file descriptors
  max-cache-files : 5000
  # max_bytes_for_level_multiplier: default is 10, you can change it to 5
  max-bytes-for-level-multiplier : 10
  