update tocs

Author: asinn826

articles/virtual-machines/linux/toc.yml

@@ -479,6 +479,11 @@
       href: boot-diagnostics.md
     - name: Serial console 
       href: serial-console.md
+      items:
+      - name: Serial Console GRUB/Single user mode
+        href: serial-console-grub-single-user-mode.md
+      - name: Serial Console NMI/SysRq
+        href: serial-console-nmi-sysrq.md
     - name: Access to applications
       href: troubleshoot-app-connection.md
     - name: Allocation failures 

articles/virtual-machines/windows/toc.yml

@@ -390,6 +390,9 @@
       href: boot-diagnostics.md
     - name: Serial console 
       href: serial-console.md
+      items:
+        - name: serial-console-cmd-ps-commands.md
+          href: CMD and PowerShell commands
     - name: Creating a VM
       href: troubleshoot-deployment-new-vm.md
     - name: Deployment issues