Update Set-AntiPhishPolicy.md

[jettan92]

Clarify that the BccMessage option in -TargetedDomainProtectionAction delivers the message to the Junk Email folder of all recipients.

From ADO 5157283.

[learn-build-service-prod]

Learn Build status updates of commit c5b627f:

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

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