Update doc to include the new attribute that targets calling extensions

[mathioli]

We are adding a new setting called PinnedCallingBarApps that targets the calling extensions. Any apps that are pinned here would be displayed in the UBAR in call window. Admins can use this setting to pin the apps exclusively for calls. This PR updates the doc to add info about this new setting.

[mathioli]

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[mathioli]

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[learn-build-service-prod]

Learn Build status updates of commit 545cadc:

✅ Validation status: passed

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

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit 791e2f7:

✅ Validation status: passed

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

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 54ff03e:

✅ Validation status: passed

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

For more details, please refer to the build report.

For any questions, please:

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[sdwheeler]

The name of the folder has changed. These files are now in teams/teams-ps/teams/MicrosoftTeams.