Update breaking change doc

[Pan-Qi]

PR Summary

Update centralized breaking change documentation for Autorest v3 to v4 migration.

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit 8795be0:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-conceptual/azps-14.4.0/breaking-changes-generated-modules.md	✅Succeeded	View (azps-14.4.0)

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 7ee410a:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-conceptual/azps-14.4.0/breaking-changes-generated-modules.md	✅Succeeded	View (azps-14.4.0)

For more details, please refer to the build report.

[mikefrobbins]

LGTM