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docs(migrations): improve instructions to add NOT NULL constraints manually to large `logger_attachment` tables (#6206)

### 👷 Description for instance maintainers

For large databases where `SKIP_HEAVY_MIGRATIONS` is required, improve
the instructions with a technique to avoid taking a long exclusive lock
while adding new `NOT NULL` constraints to `logger_attachment`

### 💭 Notes

Thanks to @Melkij

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