Update skipvalidations text

[hnguyen1218]

Submitted via Learn Editor.

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@lusassl-msft
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[learn-build-service-prod]

Learn Build status updates of commit 9a77920:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/ExchangePowerShell/Get-Label.md	✅Succeeded	View (exchange-ps)

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 5d8d2e3:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/ExchangePowerShell/Get-Label.md	✅Succeeded	View (exchange-ps)

For more details, please refer to the build report.