DOCSP-33136 clarify getDefaultRWConcern output fields (#7012)

* DOCSP-33136 clarify getDefaultRWConcern output fields

* DOCSP-33136 tech edits

* DOCSP-33136 tech edits

Author: ltran-mdb2

source/reference/command/getDefaultRWConcern.txt

@@ -88,7 +88,7 @@ The command has the following fields:
 Output
 ------
 
-The output includes the following fields:
+The output may include the following fields:
 
 .. list-table::
    :header-rows: 1
@@ -103,16 +103,20 @@ The output includes the following fields:
      - .. _getDefaultRWConcern-cmd-defaultWriteConcern:
 
        The global default :ref:`write concern <write-concern>`
-       configuration. If this field is absent, the deployment has no
-       global default write concern settings. 
+       configuration. 
+       
+       If the deployment has no global default write concern settings,
+       this field is absent from ``getDefaultRWConcern`` output. 
 
    * - :ref:`defaultReadConcern <getDefaultRWConcern-cmd-defaultReadConcern>`
      - ``object``
      - .. _getDefaultRWConcern-cmd-defaultReadConcern:
 
        The global default :ref:`read concern <read-concern>`
-       configuration. If this field is absent, the deployment has no
-       global default read concern settings.
+       configuration.
+       
+       If the deployment has no global default read concern settings,
+       this field is absent from ``getDefaultRWConcern`` output.
 
    * - :ref:`defaultWriteConcernSource <getDefaultRWConcern-cmd-defaultWriteConcernSource>`
      - String