Update chat-hero-sample.md

Removed test link and fixed URL

Author: vac0224

articles/communication-services/samples/chat-hero-sample.md

@@ -62,9 +62,7 @@ Complete the following prerequisites and steps to set up the sample.
 
    `git clone https://github.com/Azure-Samples/communication-services-web-chat-hero.git`
 
-   Or clone the repo using any method described in [Clone an existing Git repo](/azure/devops/repos/git/clone.md)
-
-   [Clone a repo](https://learn.microsoft.com/en-us/azure/devops/repos/git/clone)
+   Or clone the repo using any method described in [Clone an existing Git repo](https://learn.microsoft.com/azure/devops/repos/git/clone).
 
 3. Get the `Connection String` and `Endpoint URL` from the Azure portal or by using the Azure CLI.