DOCSP-13397 update for copy review feedback

Author: kanchana-mongodb

source/index.txt

@@ -15,7 +15,7 @@ MongoDB Shell
 .. include:: /includes/admonitions/fact-mdb-shell-beta.rst
 
 The |mdb-shell|, ``mongosh``, is a fully functional JavaScript and 
-Node.js v14.x |repl| environments for interacting with MongoDB 
+Node.js v14.x |repl| environment for interacting with MongoDB 
 deployments. You can use the|mdb-shell| to test queries and operations 
 directly with your database.