build error

Author: ajhuh-mdb

source/mapping-rules/example-insurance-data.txt

@@ -36,7 +36,7 @@ This example requires the following applications:
 
 - {+mdb-rel-mig+} version 1.4.3 or higher
 
-- `MongoDB Atlas <https://www.mongodb.com/atlas/database?tck=docs_server>__`: 
+- `MongoDB Atlas <https://www.mongodb.com/atlas/database?tck=docs_server>`__: 
    Ensure you have access to an Atlas cluster with write permissions to create 
    the new database to where you will migrate the data.