message: use precise command in nydus-fscache doc
  Add command hint `make menuconfig` to help users who are not familiar with linux kernel build.
diff: @@ -11,7 +11,7 @@ Be aware of using the fscache-enabled EROFS kernel (Linux 5.19+), it can be buil
  2. ``make olddefconfig``
  -3. Update _.config_ to enable the follow kernel configurations:
  +3. `make menuconfig` to update _.config_ to enable the follow kernel configurations:
  ```
  CONFIG_FSCACHE=m
  CONFIG_CACHEFILES=m
  