Merge pull request #8 from Meg528/patch-2

Update 30-schema-in-postgresql.mdx

Author: dfreniche

docs/30-schema-in-postgresql.mdx

@@ -2,7 +2,7 @@ import Screenshot from "@site/src/components/Screenshot";
 
 # 📘 Schema in PostgreSQL
 
-The following screenshot shows an Entity-Relationship diagram of the relational database we wish to migrate. This is a Library management app, that stores information about Books, where a Book can have many Authors, an Author can write many books, users can borrow books and leave reviews.
+The following screenshot shows an entity-relationship diagram of the relational database we wish to migrate. This is a library management app that stores information about books, where a book can have many authors, an author can write many books, and users can borrow books and leave reviews.
 
 This is the sample schema we use during our [Developer Days's Intro Lab](https://mongodb-developer.github.io/intro-lab/docs/importing-data/intro).