Updated prereq and packages sections

Author: gsteve88

includes/iot-hub-howto-device-twins-dotnet.md

@@ -11,6 +11,8 @@ ms.date: 12/31/2024
 ms.custom: mqtt, devx-track-csharp, devx-track-dotnet
 ---
 
+  * Requires Visual Studio
+
 ## Overview
 
 This article describes how to use the [Azure IoT SDK for .NET](https://github.com/Azure/azure-iot-sdk-csharp/blob/main/readme.md) to create device and backend service application code for device twins.
@@ -29,7 +31,7 @@ This section describes how to use device application code to:
 
 Device client applications written in C# require the **Microsoft.Azure.Devices.Client** NuGet package.
 
-Add this `using` statements to use the device library.
+Add this `using` statement to use the device library.
 
 ```csharp
 using Microsoft.Azure.Devices.Client;

includes/iot-hub-howto-device-twins-node.md

@@ -29,7 +29,7 @@ This section describes how to use the [azure-iot-device](/javascript/api/azure-i
 
 [!INCLUDE [iot-authentication-device-connection-string.md](iot-authentication-device-connection-string.md)]
 
-### Install SDK packages
+### Install device SDK package
 
 Run this command to install the **azure-iot-device** device SDK on your development machine:
 
@@ -262,7 +262,7 @@ This section describes how to create a backend application that:
 * Retrieves and updates a device twin
 * Creates a device twin query
 
-### Install service SDK packages
+### Install service SDK package
 
 Run this command to install **azure-iothub** on your development machine: