added new article to toc

Author: jansenbe

docs/toc.yml

@@ -1355,6 +1355,8 @@
           href: transform/modernize-userinterface-lists-and-libraries-scanner.md
         - name: Rollout approaches
           href: transform/modernize-userinterface-lists-and-libraries-rollout.md
+        - name: Opting out from modern
+          href: transform/modernize-userinterface-lists-and-libraries-optout.md
       - name: Transform classic pages to modern client-side pages
         href: transform/modernize-userinterface-site-pages.md
         items: