typo: "concern/" should become "concern."

Author: pkdone

source/release-notes/4.0.txt

@@ -74,7 +74,7 @@ MongoDB 4.0 introduces a new read concern level
 
 For a :doc:`multi-document transaction </core/transactions>`, MongoDB
 may sometimes substitute a stronger read concern for
-:readconcern:`"local"` and :readconcern:`"majority"` read concern/
+:readconcern:`"local"` and :readconcern:`"majority"` read concern.
 
 For a list of all operations that accept read concerns, see
 :ref:`read-concern-operations`.