fix capitalization

Author: GitHubber17

articles/active-directory/authentication/howto-mfa-nps-extension-rdg.md

@@ -117,7 +117,7 @@ This section provides instructions for configuring RDS infrastructure to use Azu
 As part of the configuration of the NPS extension, you need to supply admin credentials and the Azure AD ID for your Azure AD tenant. The following steps show you how to get the tenant ID.
 
 1. Sign in to the [Azure portal](https://portal.azure.com) as the global administrator of the Azure tenant.
-1. In the Azure Portal menu, select **Azure Active Directory**, or search for and select **Azure Active Directory** from any page.
+1. In the Azure portal menu, select **Azure Active Directory**, or search for and select **Azure Active Directory** from any page.
 1. Select **Properties**.
 1. In the Properties blade, beside the Directory ID, click the **Copy** icon, as shown below, to copy the ID to clipboard.