removing toc entry for file that was renamed in October.

Author: Larry Franks

articles/machine-learning/toc.yml

@@ -254,8 +254,6 @@
           href: how-to-identity-based-service-authentication.md
         - name: Manage users and roles
           href: how-to-assign-roles.md
-        - name: Use managed identities for access control
-          href: how-to-use-managed-identities.md
     - name: Network security
       items:
         - name: Virtual network overview