(Azure CXP) resolves MicrosoftDocs/azure-docs#86776

fixed variable (publicSettings) typo in code snippet

Author: VikasPullagura-MSFT

articles/virtual-machines/windows/tutorial-secure-web-server.md

@@ -132,7 +132,7 @@ Update-AzVM -ResourceGroupName $resourceGroup -VM $vm
 Use the Custom Script Extension again with [Set-AzVMExtension](/powershell/module/az.compute/set-azvmextension) to update the IIS configuration. This update applies the certificate injected from Key Vault to IIS and configures the web binding:
 
 ```azurepowershell-interactive
-$PublicSettings = '{
+$publicSettings = '{
     "fileUris":["https://raw.githubusercontent.com/Azure-Samples/compute-automation-configurations/master/secure-iis.ps1"],
     "commandToExecute":"powershell -ExecutionPolicy Unrestricted -File secure-iis.ps1"
 }'