Update Set-CsExternalAccessPolicy.md

[andcicedea]

This is an update to add a note that FederatedBilateralChats is public preview and also to correct the default value, which is False, not True

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 9a78e53:

✅ Validation status: passed

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

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 2e6bd2d:

✅ Validation status: passed

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

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit bd46284:

✅ Validation status: passed

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

For more details, please refer to the build report.