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Branding fix

Author: AnnaMHuff

articles/active-directory/external-identities/index.yml

@@ -8,7 +8,7 @@ brand: azure
 
 metadata:
   title: Microsoft Entra External ID documentation
-  description: Learn how to use Microsoft Entra External ID to manage how partners and customers sign in to your applications.
+  description: Learn how to use Microsoft Entra ID for customers to manage how partners and customers sign in to your applications.
   services: active-directory
   ms.service: active-directory
   ms.subservice: ciam