Update 20-prerequisite.mdx

Author: Meg528

docs/20-prerequisites/20-prerequisite.mdx

@@ -4,9 +4,9 @@ description: Setting up your MongoDB Atlas account, importing Library data
 
 # 👐 Set Up Lab
 
-To follow along, you'll need to complete the first two labs of the MongoDB for RDBMS professionals. Which will help you in getting:
+To follow along, you'll need to complete the first two labs of the MongoDB for RDBMS professionals, which will help you in getting:
 
-- MongoDB Atlas Cluster
+- A MongoDB Atlas cluster.
 - Test data. In this case, this is book, author, and review data for a library management system.
 
 👐 To get both, open the [intro lab](https://mongodb-developer.github.io/intro-lab/docs/intro) and follow it (only takes 10-15 mins) to get your database ready. Return here when finished!