Fix typo

Node.JS -> Node.js

Author: changeworld

articles/communication-services/toc.yml

@@ -287,7 +287,7 @@ items:
         href: quickstarts/telemetry-application-insights.md
   - name: Voice and Video
     items:
-    - name: Setup for Node.JS app
+    - name: Setup for Node.js app
       href: tutorials/building-app-start.md
     - name: Build an authentication service using Azure Functions
       href: tutorials/trusted-service-tutorial.md