message: Fix link to RamDirectory and MMapDirectory in `Directory`'s documentation
diff: @@ -96,9 +96,9 @@ fn retry_policy(is_blocking: bool) -> RetryPolicy {
  ///
  /// There are currently two implementations of `Directory`
  ///
  -/// - The [`MMapDirectory`](struct.MmapDirectory.html), this
  +/// - The [`MMapDirectory`][crate::directory::MmapDirectory], this
  /// should be your default choice.
  -/// - The [`RamDirectory`](struct.RamDirectory.html), which
  +/// - The [`RamDirectory`][crate::directory::RamDirectory], which
  /// should be used mostly for tests.
  pub trait Directory: DirectoryClone + fmt::Debug + Send + Sync + 'static {
  /// Opens a file and returns a boxed `FileHandle`.
  