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fix:[Doc]:fix format of Design Notes (#23)

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Co-authored-by: maruixiang <maruixiang@cmss.chinamobile.com>
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@ -277,7 +277,7 @@ File chunks are stored in the chunk engine. On each SSD, the persistent storage
1. *open/close* Initializes the engine by loading metadata from RocksDB and reconstructing chunk allocator states.
2. get: Retrieves chunk metadata and reference-counted handle through a hashmap cache, enabling concurrent access with O(1) average complexity.
2. *get* Retrieves chunk metadata and reference-counted handle through a hashmap cache, enabling concurrent access with O(1) average complexity.
3. *update* Implements copy-on-write (COW) semantics by allocating new chunks before modifying data. Old chunks remain readable until all handles are released.