Fix typo

Javascript -> JavaScript

Author: changeworld

articles/azure-monitor/toc.yml

@@ -117,7 +117,7 @@ items:
         - name: Client-side JavaScript
           items:
           - name: Get Started with JavaScript SDK
-            displayName: browser, client-side, Javascript (Web) SDK Loader Script
+            displayName: browser, client-side, JavaScript (Web) SDK Loader Script
             href: app/javascript-sdk.md
           - name: Configure JavaScript SDK
             href: app/javascript-sdk-configuration.md