Remove unused autorest v3 reference

[Pan-Qi]

Description

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

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[Copilot]

Pull request overview

Removes stale, commented-out guidance in two AutoRest module README.md files that referenced AutoRest PowerShell extension v3 (“3.x”), aligning the docs with the repo’s default AutoRest PowerShell extension v4 configuration.

Changes:

• Deleted commented use-extension lines suggesting @autorest/powershell: "3.x" from Policy.Autorest README.
• Deleted the same commented use-extension lines from PolicyInsights.Autorest README.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Resources/Policy.Autorest/README.md	Removes obsolete commented reference to AutoRest PowerShell extension v3.
src/PolicyInsights/PolicyInsights.Autorest/README.md	Removes obsolete commented reference to AutoRest PowerShell extension v3.