Update availability-set-overview.md

[AMcVicker]

Multiple readability improvements.

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[Copilot]

Pull request overview

Improves readability and clarity in the “Availability sets overview” article by refining key descriptions of availability sets versus availability zones and tightening wording in the update/fault domain explanations.

Changes:

• Clarifies that availability sets provide high availability but less resiliency than availability zones.
• Refines the definition and benefits of availability sets (fault domains, regional applicability, and latency).
• Simplifies wording about update domain placement and immutability of settings.

[ttorble]

@mimckitt

Can you review the proposed changes?

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[cynthn]

#sign-off

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Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @mimckitt

[learn-build-service-prod]

Learn Build status updates of commit 47acca6:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/virtual-machines/availability-set-overview.md	✅Succeeded

For more details, please refer to the build report.