Update "try Cognitive Services for free" link

v-jaswel · web-flow · commit 3139c9842824 · 2020-07-21T13:50:15.000-07:00
diff --git a/Tutorials/BingVideoSearchApp.html b/Tutorials/BingVideoSearchApp.html
@@ -1,7 +1,9 @@
 //Copyright (c) Microsoft Corporation. All rights reserved.
 //Licensed under the MIT License.
 //This piece of code provides a video search capability. Just save the file and open in browser.
-//Provide access key (read readme for free/paid keys) and get relevant video results. 
+//You will need a valid Azure subscription. . If you don't have one,
+//visit [the Microsoft Cognitive Services Web site](https://azure.microsoft.com/free/cognitive-services/),
+//create a new Azure account, and try Cognitive Services for free.
 //Make changes to this file to adapt to your desired web manifestation.
 
 <!DOCTYPE html>
