[Outlook] (shared mailbox) Update supported clients and remove content

[samantharamon]

• Adds support for new Outlook on Windows.
• Remove content as requested by the feature crew.

[learn-build-service-prod]

Learn Build status updates of commit 942682b:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/outlook/delegate-access.md	✅Succeeded	View

For more details, please refer to the build report.

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 726e0cf:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/outlook/delegate-access.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

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