Update toc.yml

Author: mimckitt

articles/virtual-machines/linux/toc.yml

@@ -276,7 +276,7 @@
     items:
     - name: Retirement starting March 1, 2023
       href: ../classic-vm-deprecation.md?toc=/azure/virtual-machines/linux/toc.json&bc=/azure/virtual-machines/linux/breadcrumb/toc.json
-    - name: Overview
+    - name: Migration Overview
       href: migration-classic-resource-manager-overview.md
     - name: Deep dive on migration
       href: migration-classic-resource-manager-deep-dive.md