Update toc.yml

Author: bhavana-129

articles/active-directory/saas-apps/toc.yml

@@ -851,7 +851,7 @@
       - name: Foodee
         href: foodee-tutorial.md
       - name: Forcepoint Cloud Security Gateway - User Authentication
-        href: forcepoint-cloud-security-gateway-tutorial
+        href: forcepoint-cloud-security-gateway-tutorial.md
       - name: ForeSee CX Suite
         href: foreseecxsuite-tutorial.md
       - name: Form.com