io_uring not available (yet?)

[Bouke]

https://www.postgresql.org/docs/18/runtime-config-resource.html#GUC-IO-METHOD

PG 18 is all about async IO. The docs should mention that we cannot yet test-drive this headline feature on Azure Postgres.

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Learn Build status updates of commit 936e8b4:

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File	Status	Preview URL	Details
articles/postgresql/flexible-server/concepts-supported-versions.md	✅Succeeded

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Pull Request Overview

This PR adds documentation about the limitation of PostgreSQL 18's async IO feature on Azure Database for PostgreSQL Flexible Server. It clarifies that the io_uring io_method configuration is not yet available during the preview phase.

• Adds a bullet point documenting the unavailability of async IO configuration in PG18 preview

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[ttorble]

@varun-dhawan

Can you review the proposed changes?

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#label:"aq-pr-triaged"
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