A1: The High temperature sensor is an analog sensor.
Q2: Is there an example code for Raspberry Pi?
A2: The example library in wiki is for Arduino.
Please use the following resources to understand using GrovePi with sensors : Getting Started with GrovePi and GrovePi Software Examples
There are examples provided in the above links for Analog read using GrovePi. Modify them to use Grove - High Temperature Sensor.