(AzureCXP) fixed powershell sample

update New-AzRoleAssignment cmdlets as per example 3 here : https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azroleassignment?view=azps-9.4.0#example-3
resolves MicrosoftDocs/azure-docs#105713

Author: MayankBargali-MSFT

articles/container-apps/microservices-dapr.md

@@ -209,7 +209,7 @@ az role assignment create --assignee $PRINCIPAL_ID  \
 ```azurepowershell
 Install-Module Az.Resources
 
-New-AzRoleAssignment -ObjectId $PrincipalId -RoleDefinitionName 'Storage Blob Data Contributor' -Scope '/subscriptions/$SubscriptionId/resourceGroups/$ResourceGroupName/providers/Microsoft.Storage/storageAccounts/$StorageAcctName'
+New-AzRoleAssignment -ObjectId $PrincipalId -RoleDefinitionName 'Storage Blob Data Contributor' -Scope "/subscriptions/$SubscriptionId/resourceGroups/$ResourceGroupName/providers/Microsoft.Storage/storageAccounts/$StorageAcctName"
 ```
 
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