Update PortingGuide.md
Update PortingGuide.md
NickolasLapp/aws-iot-device-sdk-embedded-C,aws/aws-iot-device-sdk-embedded-C,NickolasLapp/aws-iot-device-sdk-embedded-C,aws/aws-iot-device-sdk-embedded-C,aws/aws-iot-device-sdk-embedded-C,NickolasLapp/aws-iot-device-sdk-embedded-C