Revert "fix: samples arguments and remove 1 more dead link (#1785)"

This reverts commit 43ffebd.

iothub/device/samples/readme.md

@@ -15,11 +15,10 @@ This folder contains simple samples showing how to use the various features of M
 - [Plug and Play device samples][d-pnp-sample]
 - [Xamarin sample][d-xamarin-sample]
 
-### Module sample
+### [Module samples][module-samples]
 
 - [Message sample][m-message-sample]
-    - This sample illustrates how to write an IoT Hub module to handle connection issues, connection-related exceptions, and how to manage the lifetime of the `ModuleClient`
-    - Includes sending messages and symmetric key failover
+- [Twin sample][m-twin-sample]
 
 ### Prerequisites
 
@@ -42,24 +41,22 @@ You need to clone the repository or download the sample (the one you want to try
 
 #### Build and run the samples
 
-1. Building the sample application
+1. Preparing the sample application:
+   1. Set the following environment variables on the terminal from which you want to run the application.
+
+      - IOTHUB_DEVICE_CONNECTION_STRING
+
+1. Building the sample application:
 
     To build the sample application using dotnet, from terminal navigate to the sample folder (where the .csproj file lives). Then execute the following command and check for build errors:
 
     ```console
     dotnet build
     ```
 
-1. Preparing the sample application:
-   1. Many of these samples take parameters. To see the parameters required, type:
-
-      ```console
-      dotnet run --help
-      ```
-
 1. Running the sample application:
 
-    To run the sample application using dotnet, execute the following command with any required parameters discovered in the previous step.
+    To run the sample application using dotnet, execute the following command.
 
     ```console
     dotnet run
@@ -76,7 +73,9 @@ You need to clone the repository or download the sample (the one you want to try
 [d-pnp-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/PnpDeviceSamples
 [d-xamarin-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/XamarinSample
 
-[m-message-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/module/ModuleSample
+[module-samples]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/module
+[m-message-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/module/MessageSample
+[m-twin-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/module/TwinSample
 
 [lnk-setup-iot-hub]: https://aka.ms/howtocreateazureiothub
 [lnk-manage-iot-device]: https://github.com/Azure/azure-iot-device-ecosystem/blob/master/setup_iothub.md#create-new-device-in-the-iot-hub-device-identity-registry