ascending -> descending (#87)

Author: Chris Cho

source/usage-examples/findOne.txt

@@ -38,7 +38,7 @@ collection. It uses the following:
 - A **query document** that configures the query to return only
   movies with the title of exactly the text ``'The Room'``.
 
-- A **sort** that organizes matched documents in ascending order by
+- A **sort** that organizes matched documents in descending order by
   rating, so if our query matches multiple documents the returned
   document will be the document with the highest rating.