message: fix invalid struct type in comments
diff: @@ -1095,7 +1095,7 @@ pub mod v5 {
  ///
  /// Rafs filesystem stores filesystem metadata in a single metadata blob, and stores file
  /// content in zero or more data blobs, which are separated from the metadata blob.
  - /// A `Rafsv5ChunkInfo` object describes how a Rafs v5 chunk is located within a data blob.
  + /// A `BlobV5ChunkInfo` object describes how a Rafs v5 chunk is located within a data blob.
  /// It is abstracted because Rafs have several ways to load metadata from metadata blob.
  pub trait BlobV5ChunkInfo: BlobChunkInfo {
  /// Get the chunk index in the Rafs v5 metadata's chunk info array.
  