Fixed warning

Author: SnehaSudhirG

articles/update-center/toc.yml

@@ -17,7 +17,7 @@
   - name: Update and maintenance options
     href: updates-maintenance-schedules.md
   - name: Schedule patching configuration on Azure VMs for business continuity
-    href: prerequsite-for-schedule-patching
+    href: prerequsite-for-schedule-patching.md
   - name: Assessment options
     href: assessment-options.md
   - name: Query resources with Azure Resource Graph