Update New-CsOnlinePSTNGateway.md

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[learn-build-service-prod]

Learn Build status updates of commit 1174288:

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[learn-build-service-prod]

Learn Build status updates of commit 666e297:

✅ Validation status: passed

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teams/teams-ps/teams/New-CsOnlinePSTNGateway.md	✅Succeeded	View (teams-ps)

For more details, please refer to the build report.