Update Set-OwaMailboxPolicy.md

Author: chrisda

exchange/exchange-ps/exchange/Set-OwaMailboxPolicy.md

@@ -2065,6 +2065,8 @@ Accept wildcard characters: False
 ### -SMimeSuppressNameChecksEnabled
 This parameter is available only in the cloud-based service.
 
+The SMimeSuppressNameChecksEnabled switch specifies whether to suppress name check in S/MIME messages. You don't need to specify a value with this switch.
+
 ```yaml
 Type: Boolean
 Parameter Sets: (All)