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Update wal.md

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tsdb/docs/format/wal.md
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@ -17,7 +17,8 @@ Notable deviations are that the record fragment is encoded as:
└───────────┴──────────┴────────────┴──────────────┘
```
The type flag has the following states:
The type flag is comprised of three components: a 3-bit reserved field, a 1-bit zstd compression flag, a 1-bit snappy compression flag, and a 3-bit type flag.
The lowest 3 bits within this flag represent the record type as follows:
* `0`: rest of page will be empty
* `1`: a full record encoded in a single fragment