fix spelling per Acrolinx report

Author: GitHubber17

articles/billing/billing-azure-subscription-past-due-balance.md

@@ -20,7 +20,7 @@ ms.author: banders
 ---
 # Resolve past due balance for your Azure subscription
 
-If your payment isn't received or if we can't process your payment, you might get an email or see an alert in the Azure Portal or Account Center.
+If your payment isn't received or if we can't process your payment, you might get an email or see an alert in the Azure portal or Account Center.
 If you are the [Account Administrator](billing-subscription-transfer.md#whoisaa), you can settle the outstanding charges in the [Azure portal](https://portal.azure.com). If you are on an invoice mode of payment, send your payment to the location listed at the bottom of your invoice.
 
 > [!IMPORTANT]