docs: update link

Author: fmenezes

README.md

@@ -109,7 +109,7 @@ You may experiment asking `Can you connect to my mongodb instance?`.
 - `atlas-list-db-users` - List MongoDB Atlas database users
 - `atlas-create-db-user` - List MongoDB Atlas database users
 
-NOTE: atlas tools are only available when you set credentials and do not set connection string on configuration.
+NOTE: atlas tools are only available when you set credentials and do not set connection string on [configuration](#configuration) section.
 
 #### MongoDB Database Tools