Added note

Author: dfreniche

docs/30-simple-queries/1-empty-aggregation.mdx

@@ -5,7 +5,7 @@ import TabItem from '@theme/TabItem';
 
 ## An empty aggregation
 
-This code returns a [cursor](https://www.mongodb.com/docs/manual/reference/method/js-cursor/) with all documents in the `authors` collection:
+This code is the equivalent to a `SELECT * FROM AUTHORS`. Returns a [cursor](https://www.mongodb.com/docs/manual/reference/method/js-cursor/) with all documents in the `authors` collection:
 
 <Tabs groupId="aggregations">
   <TabItem value="mongosh" label="mongosh">