OOB publish main to live: Update Set-CsExternalAccessPolicy.md

[garycentric]

This PR is to publish PR #12162, which has the pertinent details in its description.

[learn-build-service-prod]

Learn Build status updates of commit 3d50aaa:

✅ Validation status: passed

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

For more details, please refer to the build report.

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