redirection correction

Author: davidmu1

.openpublishing.redirection.active-directory.json

@@ -10,6 +10,11 @@
       "redirect_url": "/azure/active-directory/develop/active-directory-saml-claims-customization",
       "redirect_document_id": false
     },
+    {
+      "source_path_from_root": "/articles/active-directory/authentication/how-to-mfa-microsoft-managed.md",
+      "redirect_url": "/azure/active-directory/authentication/concept-authentication-default-enablement",
+      "redirect_document_id": false
+    },
     {
       "source_path_from_root": "/articles/active-directory/authentication/concept-certificate-based-authentication-mobile.md",
       "redirect_url": "/azure/active-directory/authentication/concept-certificate-based-authentication-mobile-ios",