GHI Azure IoTHub documentation differs from msft documentation

[martincalsyn]

See: https://forums.ghielectronics.com/t/azure-iot-questions/25260

The Target = “http://your.azure-devices.net/”, example code should include a device path.

This appears in :

• software/tinyclr/tutorials/azure.md
• docs/software/tinyclr/tutorials/azure.html

I haven't done the PR because I have not personally tested this.