Add groupId filtering for demo_key reviews

[ck1125]

Currently working on integrating with the API and unsure about how to make calls that retrieve all reviews for all products in a given groupId for an organization. Please modify the documents to show how this works and what the response data looks like.

Thanks.

[Antti]

@ck1125 Can you elaborate, what is groupId? Is it our product_group_id?

[ck1125]

Yes the product_group_id. Apologies about the wrong terminology and late response.