[Outlook] (shared mailboxes) Document scenarios for add-in availability in shared mailboxes

[samantharamon]

Includes improvements for shared mailboxes opened in a new tab or window in Outlook on the web.

[learn-build-service-prod]

Learn Build status updates of commit 8aa7137:

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[learn-build-service-prod]

Learn Build status updates of commit 7efe114:

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[learn-build-service-prod]

Learn Build status updates of commit ee70212:

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[learn-build-service-prod]

Learn Build status updates of commit 1b2c219:

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[learn-build-service-prod]

Learn Build status updates of commit 435ed5f:

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[learn-build-service-prod]

Learn Build status updates of commit 27173a7:

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[learn-build-service-prod]

Learn Build status updates of commit 5c447b6:

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[learn-build-service-prod]

Learn Build status updates of commit 3fe90a2:

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[learn-build-service-prod]

Learn Build status updates of commit c40bc82:

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