Update overview.md

Author: iaulakh

articles/communication-services/samples/overview.md

@@ -19,7 +19,7 @@ Azure Communication Services has many samples available, which you can use to te
 
 | Sample Name                                                                                          | Description                                                         | Languages/Platforms Available      |
 | :--------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------ | :--------------------------------- |
-| [Calling Hero Sample](./calling-hero-sample.md)                                                | Provides a sample of creating a calling application.          | [Web](https://github.com/Azure-Samples/communication-services-web-calling-hero), [iOS](https://github.com/Azure-Samples/communication-services-ios-calling-hero)|
+| [Calling Hero Sample](./calling-hero-sample.md)                                                | Provides a sample of creating a calling application.          | [Web](https://github.com/Azure-Samples/communication-services-web-calling-hero), [iOS](https://github.com/Azure-Samples/communication-services-ios-calling-hero), [Android](https://github.com/Azure-Samples/communication-services-android-calling-hero)                           |
 | [Chat Hero Sample](./chat-hero-sample.md) | Provides a sample of creating a chat application. | [Web](https://github.com/Azure-Samples/communication-services-web-chat-hero)                    |
 | [Trusted Authentication Server Sample](./trusted-auth-sample.md) | Provides a sample implementation of a trusted authentication service used to generate user and access tokens for Azure Communication Services. The service by default maps generated identities to Azure Active Directory | [node.JS](https://github.com/Azure-Samples/communication-services-authentication-hero-nodejs), [C#](https://github.com/Azure-Samples/communication-services-authentication-hero-csharp)
 | [Web Calling Sample](./web-calling-sample.md)                                                        | A step by step walk-through of Azure Communication Services Calling features, including PSTN, within the Web. | [Web](https://github.com/Azure-Samples/communication-services-web-calling-tutorial/)                                |