SA feedback

Author: norareidy

source/databases-collections.txt

@@ -27,7 +27,7 @@ MongoDB organizes data into a hierarchy of the following levels:
 
 - **Databases**: Top-level data structures in a MongoDB deployment that store collections.
 - **Collections**: Groups of MongoDB documents. They are analogous to tables in relational databases.
-- **Documents**: Units that store literal data such as string, numbers, dates, and other embedded documents.
+- **Documents**: Units that store literal data such as strings, numbers, dates, and other embedded documents.
   For more information about document field types and structure, see the
   :manual:`Documents </core/document/>` entry in the {+mdb-server+} manual.