docs: Fix example result of getBrand() (#719)
docs: Fix example result of getBrand() (#719)

Changed 'Xiaomi' to 'xiaomi'. (this might get confused)
rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info