Update wal.md (#10442)

update exemplar record type

Signed-off-by: songjiayang <songjiayang1@gmail.com>
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songjiayang 2022-03-16 01:03:45 +08:00 committed by GitHub
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@ -99,7 +99,7 @@ See: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/Op
```
┌──────────────────────────────────────────────────────────────────┐
│ type = 5 <1b>
│ type = 4 <1b>
├──────────────────────────────────────────────────────────────────┤
│ ┌────────────────────┬───────────────────────────┐ │
│ │ id <8b> │ timestamp <8b> │ │