Remove about topics from DSC redirection

[sdwheeler]

PR Summary

Remove about topics from DSC redirection

This should fix the 404 problem we have with the about topics since we moved the files to a new repo.

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]

Learn Build status updates of commit 973f558:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
.openpublishing.redirection.dsc.json	⚠️Warning		Details

.openpublishing.redirection.dsc.json

• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.
• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 728f5ce:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
.openpublishing.redirection.dsc.json	⚠️Warning		Details

.openpublishing.redirection.dsc.json

• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.
• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 728f5ce:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
.openpublishing.redirection.dsc.json	⚠️Warning		Details

.openpublishing.redirection.dsc.json

• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.
• [Warning: redirection-removed - See documentation] Redirection rule /PowerShell/module/psdesiredstateconfiguration/about/about_classes_and_dsc defined in .openpublishing.redirection.dsc.json was deleted or changed. To avoid broken links, please don't remove the redirection rule.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel