DOCSP-44480-copilot-toc-label (#99)

Author: ltran-mdb2

source/index.txt

@@ -56,7 +56,7 @@ Get Started
    Connect </connect>
    Manage Data </databases-collections>
    Explore with Playgrounds </playgrounds>
-   GitHub Copilot Participant </copilot>
+   MongoDB Extension for Github Copilot </copilot>
    Create an Atlas Cluster with Terraform </create-cluster-terraform>
    Reference </reference>
    Changelog <https://github.com/mongodb-js/vscode/releases>