updating notify audit's description and default value (#273)

* updating notify audit

* Remove default

---------

Co-authored-by: Sherzod Karimov <sherzod.karimov@datadoghq.com>

Author: HantingZhang2

datadog-monitors-monitor-handler/datadog-monitors-monitor-configuration.json

@@ -165,7 +165,7 @@
                     "type": "integer"
                 },
                 "NotifyAudit": {
-                    "description": "Whether or not to notify tagged users when changes are made to the monitor",
+                    "description": "A Boolean indicating whether tagged users is notified on changes to this monitor.",
                     "type": "boolean"
                 },
                 "NotifyBy": {

datadog-monitors-monitor-handler/datadog-monitors-monitor.json

@@ -170,7 +170,7 @@
           "type": "integer"
         },
         "NotifyAudit": {
-          "description": "Whether or not to notify tagged users when changes are made to the monitor",
+          "description": "A Boolean indicating whether tagged users is notified on changes to this monitor.",
           "type": "boolean"
         },
         "NotifyBy":{

datadog-monitors-monitor-handler/docs/monitoroptions.md

@@ -180,7 +180,7 @@ _Update requires_: [No interruption](https://docs.aws.amazon.com/AWSCloudFormati
 
 #### NotifyAudit
 
-Whether or not to notify tagged users when changes are made to the monitor
+A Boolean indicating whether tagged users is notified on changes to this monitor.
 
 _Required_: No