Update toc.yml

Author: nehakulkarni123

articles/governance/policy/toc.yml

@@ -54,6 +54,9 @@
   - name: Disallow resource types
     displayName: assign, definition, resource, type, exclusion, allow, disallow
     href: ./tutorials/disallowed-resources.md
+  - name: Apply MFA self-enforcement through Azure Policy
+    displayName: assign, definition, enforce
+    href: ./tutorials/mfa-enforcement.md
 - name: Samples
   items:
   - name: Index