message: Fix a typo
  It should be data deduplication.
diff: @@ -5,7 +5,7 @@ a container image format that improves over the current OCI image
  specification. Its key features include:
  * Container images are downloaded on demand
  -* Chunk level data duplication
  +* Chunk level data deduplication
  * Flatten image metadata and data to remove all intermediate layers
  * Only usable image data is saved when building a container image
  * Only usable image data is downloaded when running a container
  