Added TOC and updated the Acrolinx comments

Author: dramasamy

articles/operator-nexus/TOC.yml

@@ -157,7 +157,7 @@
           href: howto-kubernetes-cluster-action-restart.md
         - name: Customize cluster DNS
           href: how-to-customize-kubernetes-cluster-dns.md
-        - name: Customize Worker Nodes
+        - name: Customize worker nodes
           href: howto-kubernetes-cluster-customize-workers.md
         - name: Manage SSH keys
           href: howto-kubernetes-cluster-manage-ssh-key.md