Fixed some rendering issues.

openedx/core/djangoapps/schedules/README.rst

@@ -101,8 +101,8 @@ Glossary
    the number of emails each task must send.
 
 -  **Email Backend**: An external service that ACE will use to deliver emails.
-	 Right now, ACE only supports `Sailthru <http://www.sailthru.com/>` as an 
-     email backend.
+   Right now, ACE only supports `Sailthru <http://www.sailthru.com/>`__ as an
+   email backend.
 
 
 A System Diagram