trivial: tweak wording of list

Author: kay-kim

source/includes/extracts-4.0-upgrade-prereq.yaml

@@ -53,11 +53,9 @@ content: |
 ref: 4.0-upgrade-incompatible-options-rs
 content: |
 
-   Starting in MongoDB 4.0:
-
       - .. include:: /includes/wiredtiger-node-nojournal.rst
 
-      - You cannot use :option:`--noIndexBuildRetry <mongod
+      - Starting in MongoDB 4.0, you cannot use :option:`--noIndexBuildRetry <mongod
         --noIndexBuildRetry>` :setting:`storage.indexBuildRetry` for a
         :binary:`~bin.mongod` instance that is part of a replica set.