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Postgres padding alignment: fix and improve

Nikolay Samokhvalov requested to merge docs-postgres-column-order-optimization into master

What does this MR do and why?

Polish the document about optimization of column order in Postgres tables.

  • Fix the information about alignment for various data types
  • Simplify and elaborate the example (get rid of confusing varlena, provide a concrete example, show details with pageinspect)

Triggered by discussion: https://news.ycombinator.com/item?id=32071557

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Nikolay Samokhvalov

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