fixed toc entry

Author: cwhitley-MSFT

support/azure/virtual-machines/windows/toc.yml

@@ -339,7 +339,7 @@
     - name: Azure VM startup hangs at "IRQL_NOT_LESS_OR_EQUAL"
       href: interrupt-request-line-not-less-equal.md
     - name: Bug Check 0x00000019 - BAD_POOL_HEADER
-      href: BAD_POOL_HEADER
+      href: bad_pool_header.md
     - name: Troubleshoot Windows VM OS with missing boot manager
       href: os-bootmgr-missing.md
     - name: OS isn't found