Update how-to-visual-studio-develop-module.md

Step 4 was described in more detail

Author: ddobric

articles/iot-edge/how-to-visual-studio-develop-module.md

@@ -345,7 +345,7 @@ In the quickstart article that you used to set up your IoT Edge device, you depl
         cd config
     ```
 
-1. From your **config** folder, execute the following deployment command. Replace the `[device id]`, `[hub name]`, and `[file path]` with your values. 
+1.	In this step, the *iotedge* device will be prepared in the *IotHub*. If the *iotedge* device does not exist in the *iothub*, it must be created. The command described in this step will configure the device to use modules developed in your solution. The corresponding configuration was created in the previous step and stored in the **config** folder. From your **config** folder, execute the following deployment command. Replace the `[device id]`, `[hub name]`, and `[file path]` with your values.
 
     ```cmd
         az iot edge set-modules --device-id [device id] --hub-name [hub name] --content [file path]