Address doc issue

[SukanyaDas-MSFT]

Issue: #14112
Description: Deleting existing article, redirect to main overview.
Article to be deleted: https://learn.microsoft.com/en-us/microsoftteams/platform/resources/teams-updates

[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 and severity-2 issues. 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 294bfd5:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.redirection.json	✅Succeeded	View
msteams-platform/resources/teams-updates.md	✅Succeeded	n/a (file deleted or renamed)
msteams-platform/TOC.yml	✅Succeeded	View

For more details, please refer to the build report.

[nickwalkmsft]

@SukanyaDas-MSFT this is good; can you also scrub the docs for links to this page and see about removing them or modifying as appropriate?

In general, this change is so old that it's no longer of any concern, so we don't need to have any remaining guidance about things that, say, used to be supported and no longer are.

If you find things that are of significant impact, like big pieces of content that no longer make sense, let me know and I can review.