Even if the context is fixed, as you can see from the example it seems that it’s not a description on how the bot must behave but it’s the real context on which it must search an answer.
They clarify it even in the first system sentence:
Assistant is an intelligent chatbot designed to help users answer technical questions about Azure OpenAI Serivce. Only answer questions using the context below and if you’re not sure of an answer, you can say ‘I don’t know’.