DOCSP-23892 adds warning for cluster options (#387) (#394)

* DOCSP-23892 adds warning for cluster options

* Fix incorrect directive

Author: jwilson-mdb

source/includes/warn-option-cluster-password-visibility.rst

@@ -0,0 +1,8 @@
+.. warning::
+   On some systems, providing a password in a connection string with 
+   the ``--cluster0`` or ``--cluster1`` options may make the password 
+   visible to system status programs, such as ``ps``, that may be invoked 
+   by other users.
+
+   Consider using the :option:`--config` option to specify a 
+   configuration file containing the password instead.

source/reference/mongosync.txt

@@ -84,13 +84,17 @@ Global Options
    To set the ``--cluster0`` option from a configuration file,
    see the :setting:`cluster0` setting.
 
+   .. include:: /includes/warn-option-cluster-password-visibility.rst
+
 .. option:: --cluster1 <uri>
 
    .. include:: /includes/opts/cluster1.rst
 
    To set the ``--cluster1`` option from a configuration file,
    see the :setting:`cluster1` setting.
 
+   .. include:: /includes/warn-option-cluster-password-visibility.rst
+
 .. option:: --config <filename>
 
    Sets the path to the configuration file.