updated list of span attributes for product reviews service

Author: dmitchsplunk

content/en/docs/demo/telemetry-features/manual-span-attributes.md

@@ -97,11 +97,12 @@ This page lists the manual Span Attributes used throughout the demo:
 
 ## Product Reviews
 
-| Name                        | Type   | Description                    |
-| --------------------------- | ------ | ------------------------------ |
-| `app.product.id`            | string | Product ID                     |
-| `app.product_reviews.count` | string | Number of product reviews      |
-| `app.product.question`      | number | Question asked about a product |
+| Name                                | Type   | Description                    |
+|-------------------------------------|--------|--------------------------------|
+| `app.product.id`                    | string | Product ID                     |
+| `app.product_reviews.count`         | number | Number of product reviews      |
+| `app.product_reviews.average_score` | number | Average product review score   |
+| `app.product.question`              | string | Question asked about a product |
 
 ## Quote