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This change adds documentation for the LoroDoc.export data format. It includes details about the overall file structure, header, body, and the different encoding modes.


PR created automatically by Jules for task 3967360466236518918 started by @zxch3n

This change adds documentation for the LoroDoc.export data format in
`docs/export-format.md`.

The documentation includes:
- An overview of the file structure (header and body).
- Details about the header fields: magic bytes, checksum, and encode mode.
- A description of the `FastSnapshot` and `FastUpdates` body formats.
- References to the relevant source code files for further exploration.
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This change enriches the documentation for the LoroDoc.export data format in `docs/export-format.md`.

The updated documentation now includes:
- More detail on the checksum calculation (xxhash32 with seed).
- An explanation that the data chunks (oplog, state, gc) are stored in an SSTable format.
- A high-level overview of the SSTable structure, including its header, block types, and meta section.
- An updated "Source Code References" section that includes a link to the `kv-store` crate.
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