fix capitalization for GitHub

Author: GitHubber17

articles/iot-hub/virtual-network-support.md

@@ -319,9 +319,9 @@ To use this region-limited version of the Azure IoT SDKs with virtual network su
 
 2. Download the SDK:  [Java](https://aka.ms/vnetjavasdk) | [C#](https://aka.ms/vnetcsharpsdk) | [Node.js](https://aka.ms/vnetnodesdk)
 
-For Python, download our limited version from Github.
+For Python, download our limited version from GitHub.
 
-1. Navigate to the [Github release page](https://aka.ms/vnetpythonsdk).
+1. Navigate to the [GitHub release page](https://aka.ms/vnetpythonsdk).
 
 2. Download the following file, which you'll find at the bottom of the release page under the header named **assets**.
     > *azure_iot_hub-2.2.0_limited-py2.py3-none-any.whl*
@@ -338,4 +338,4 @@ Use the links below to learn more about IoT Hub features:
 
 * [Message routing](./iot-hub-devguide-messages-d2c.md)
 * [File upload](./iot-hub-devguide-file-upload.md)
-* [Bulk device import/export](./iot-hub-bulk-identity-mgmt.md) 
+* [Bulk device import/export](./iot-hub-bulk-identity-mgmt.md)