DOCSP-10044 doc updates for new verbosity mode (#20)

* DOCSP-10044 doc updates for new verbosity mode

Author: kanchana-mongodb

source/supported-unsupported/mql-support.txt

@@ -191,7 +191,15 @@ Diagnostic Commands
        * ``count()``
        * ``find()``
 
-       The ``verbosity`` option is not supported.
+       The following ``verbosity`` modes are supported: 
+
+       - ``queryPlanner`` - provides information on the query plan.
+       - ``queryPlannerExtended`` - provides detailed information on the 
+         query plan including information about the |s3| objects, such as 
+         the |s3| object names and sizes, that will be queried.
+      
+       The ``executionStats`` and ``allPlansExecution`` modes are not 
+       supported.
 
    * - :manual:`getLog </reference/command/getlog>`