(DOCSP-22101): Added required privileges and a link.

Author: corryroot

source/schema/resample-schema.txt

@@ -29,7 +29,10 @@ the ``FLUSH SAMPLE`` command from within the
 
 .. note::
 
-   You cannot use the ``FLUSH SAMPLE`` command if :binary:`~bin.mongosqld`
+   To use the ``FLUSH SAMPLE`` command, you must have the 
+   :authaction:`insert` and :authaction:`update` privileges. To learn 
+   more, see :ref:`user-authorization`. You can't use the 
+   ``FLUSH SAMPLE`` command if :binary:`~bin.mongosqld`
    starts with a :ref:`schema file <schema-with-drdl-file>`
    via the :option:`--schema <mongosqld --schema>` option.