Fix typo in 4.0-compatibility.txt

Author: tgoodyear

source/release-notes/4.0-compatibility.txt

@@ -108,7 +108,7 @@ You cannot specify :option:`--noIndexBuildRetry <mongod
 --noIndexBuildRetry>` or :setting:`storage.indexBuildRetry` with
 :option:`--replSet <mongod --replSet>` or
 :setting:`replication.replSetName`. That is, you cannot use
-:option:`--noIndexBuildRetry <mongod --noIndexBuildRetry>`
+:option:`--noIndexBuildRetry <mongod --noIndexBuildRetry>` or
 :setting:`storage.indexBuildRetry` for a :binary:`~bin.mongod` instance
 that is part of a replica set.