Add deprecation warning for Document Library tab creation via Graph API

[khaira777]

Microsoft support has confirmed that the Document Library tab creation method using app ID com.microsoft.teamspace.tab.files.sharepoint is deprecated and no longer supported via Graph API. This commit adds a warning to the documentation to prevent developers from using this outdated method.

Important

Required for API changes:

• [] Link to API.md file: ADD LINK HERE
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl) PR DOESN'T INCLUDE API.MD or PERMISSIONS CHANGES: ADD LINK HERE

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Add other supporting information, such as a description of the PR changes:

This PR adds a [!WARNING] callout to the "Document library tabs" section to inform developers that the method for creating document library tabs using the app ID com.microsoft.teamspace.tab.files.sharepoint is deprecated and no longer supported via Microsoft Graph API.

The change is based on confirmation from Microsoft support that this method is no longer functional and should not be used. This update helps prevent confusion and errors for developers referencing outdated documentation.

References:

• https://learn.microsoft.com/en-us/answers/questions/2156369/not-able-to-see-document-library-content-inside-ms?comment=answer-1912817&page=1#comment-2088907
• Microsoft External Staff response (via Prasad-MSFT, July 2025)

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[learn-build-service-prod]

Learn Build status updates of commit 9bf79aa:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/teams-configuring-builtin-tabs.md	✅Succeeded

For more details, please refer to the build report.

[Danielabom]

Please review our deprecation guidelines and update the note accordingly (https://eng.ms/docs/products/microsoft-graph-service/microsoft-graph/document-apis/reference-content/document-deprecated-apis).

[Danielabom]

@khaira777, please see my feedback.

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@@khaira777, your content reviewer has requested changes to your pull request. Please review feedback and address accordingly as soon as possible to keep your pull request moving forward.

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[Danielabom]

@khaira777, friendly reminder to review my feedback.

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Hello @@khaira777! This pull request has been inactive for 4 weeks with the changes requested label. Please address the feedback left by your reviewer and add the review feedback addressed. If you have any questions, please contact your reviewer.

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