update toc title for node access

Author: erik-ha-msft

articles/aks/TOC.yml

@@ -473,7 +473,7 @@
       items:
         - name: Common issues
           href: troubleshooting.md
-        - name: SSH node access
+        - name: Node access
           href: ssh.md
         - name: Linux performance tools
           href: troubleshoot-linux.md