Update -Identity Parameter for SetExternal

[krubenok]

The -Identity parameter for Set-ExternalInOutlook is optional and generally not required as the original documentation indicates, but recent instances of customer feedback have indicated some of the potentially unexpected side effects of passing it.

In cases where the identity is not resolved or a specific user GUID is passed, the command will execute without error and act on the organization as a whole derived from the admin's identity. This changes makes this behavior more clear. Not that other cmdlets such as Set-IRMConfiguration also exhibit this behavior, though we are not aware of similar feedback on those ones yet (nor am I in a position of knowledge on them).

@chrisda could you please review?

[learn-build-service-prod]

Learn Build status updates of commit e7b2111:

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[learn-build-service-prod]

Learn Build status updates of commit e972e5e:

✅ Validation status: passed

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exchange/exchange-ps/exchange/Set-ExternalInOutlook.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit 38fcd19:

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[learn-build-service-prod]

Learn Build status updates of commit beeb236:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-ExternalInOutlook.md	✅Succeeded	View (exchange-ps)

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For any questions, please:

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