formatting fix for change streams page

Author: jeff-allen-mongo

source/changeStreams.txt

@@ -738,8 +738,8 @@ See :ref:`change-stream-resume-token` for more information on the resume token.
 .. important::
 
    - The oplog must have enough history to locate the operation
-      associated with the token or the timestamp, if the timestamp is in
-      the past.
+     associated with the token or the timestamp, if the timestamp is in
+     the past.
 
    - .. include:: /includes/extracts/changestream-invalid-events.rst