Describe how dataStateAt is determined

A small MR just adding a comment to simplify understanding of the DSA extraction algorithm

@akartasov I'm not sure what code style for such comments we should use – let me know if adjustments are needed.

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@NikolayS, thanks. It looks good. To merge, fix the linter warning, please: https://gitlab.com/postgres-ai/database-lab/-/jobs/1741257451#L29

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