Update Set-SPORestrictedSiteCreation.md

[vgaddam-pm]

Added -SimulationMode

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 00ab1ac:

✅ Validation status: passed

File	Status	Preview URL	Details
sharepoint/sharepoint-ps/Microsoft.Online.SharePoint.PowerShell/Set-SPORestrictedSiteCreation.md	✅Succeeded	View (sharepoint-ps)

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[samkabue]

SimulationMode

why not use the standard PowerShell param -WhatIf?

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_commonparameters?view=powershell-5.1#-whatif