Fix typo

Author: changeworld

articles/communication-services/quickstarts/voice-video-calling/includes/get-started/get-started-javascript.md

@@ -13,7 +13,7 @@ In this quickstart, you'll learn how start a call using the Azure Communication
 
 ## Sample code
 
-You can download the sample app from [Github](https://github.com/Azure-Samples/communication-services-javascript-quickstarts/tree/main/add-1-on-1-voice-calling).
+You can download the sample app from [GitHub](https://github.com/Azure-Samples/communication-services-javascript-quickstarts/tree/main/add-1-on-1-voice-calling).
 
 ## Prerequisites