user doc: One more update to clarify values/fields
@@ -36,7 +36,8 @@ a data mapper step before this connection:
that is before the connection that you just added.
.. Click *Data Mapper*.
.. In the data mapper, map source fields to the target
-resource fields.
+resource fields. The new resources contain only the
+target fields that you map to.
.. Click *Done* to add the data mapper step to the flow.
.Result
