Add note about writeConcern for tools being changed

writeConcern for ingest for tools is majority as of 3.0

Signed-off-by: kay <[email protected]>

Author: asya999

source/release-notes/3.0.txt

@@ -465,7 +465,8 @@ project.
 
 - Added configurable :term:`write concern` to :program:`mongoimport`,
   :program:`mongorestore`, and :program:`mongofiles`. Use the
-  ``--writeConcern`` option.
+  ``--writeConcern`` option.  The default writeConcern has been
+  changed to 'w:majority'.
 
 - :program:`mongofiles` now allows you to configure the GridFS prefix
   with the ``--prefix`` option so that you can use custom namespaces