Fix

Author: mcmorisi

source/reference/migration.txt

@@ -120,7 +120,7 @@ The following Motor method signatures behave differently in the {+driver-async+}
 
    If you are experiencing performance slowdown, identify whether the {+driver-async+} driver
    is necessary for your usecase. If you determine your use case is better served by
-   synchronous {+driver-short+}, consider using synchronous {+driver-short+}
+   synchronous {+driver-short+}, consider using the synchronous driver
    with ``asyncio.loop.run_in_executor()`` for asynchronous compatibility. To learn more, see
    the `Event Loop API documentation <https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.run_in_executor>`__.