Update TOC title

Author: maud-lv

articles/managed-grafana/toc.yml

@@ -124,6 +124,6 @@ items:
     href: https://aka.ms/managed-grafana/feature-request
   - name: Support
     href: find-help-open-support-ticket.md
-  - name: Grafana Labs VS Code extension
+  - name: VS Code extension for Grafana
     href: https://marketplace.visualstudio.com/items?itemName=Grafana.grafana-vscode