Update cross-tenant-access-overview.md

Added "ms.custom: engagement-fy23” metadata to the article.

Author: csmulligan

articles/active-directory/external-identities/cross-tenant-access-overview.md

@@ -10,7 +10,7 @@ ms.date: 08/05/2022
 ms.author: mimart
 author: msmimart
 manager: celestedg
-ms.custom: "it-pro"
+ms.custom: engagement-fy23, "it-pro"
 ms.collection: M365-identity-device-management
 ---