Docs: azurerm_postgresql_flexible_server Change example SKU and Tier to a less expensive option

[wyattfry]

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Description

The example gives very expensive options for this resource. This change modifies the example to a less expensive configuration.

PR Checklist

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• I have checked to ensure there aren't other open Pull Requests for the same update/change.
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Changes to existing Resource / Data Source

N/A

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Change Log

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Related Issue(s)

Fixes #25806

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[mbfrahry]

LGTM!