correct "Azure Portal" per Acrolinx

Author: American-Dipper

articles/marketplace/partner-center-portal/pc-saas-registration.md

@@ -1,6 +1,6 @@
 ---
 title: Register a SaaS application - Azure Marketplace 
-description: Learn how to use the Azure Portal to register a SaaS application and receive an Azure Active Directory security token.
+description: Learn how to use the Azure portal to register a SaaS application and receive an Azure Active Directory security token.
 author: dsindona
 ms.service: marketplace
 ms.subservice: partnercenter-marketplace-publisher