{AzureMaintenance} fixes #19193 PreTask and PostTask detailed description and a minor code bug (#20539)

* {AzureMaintenance} fixes #19193 PreTask and PostTask detailed description

fixes #19193 

This PR provides a detailed description for PreTask and PostTask parameters.

* Update MaintenanceConfigurationCreateOrUpdateMethod.cs

* Update MaintenanceConfigurationCreateOrUpdateMethod.cs

My suggestion makes compilation failure. Revert the change

Co-authored-by: Dingmeng Xue <[email protected]>

Author: navba-MSFT

src/Maintenance/Maintenance/MaintenanceConfiguration/MaintenanceConfigurationCreateOrUpdateMethod.cs

@@ -269,12 +269,12 @@ public override void ExecuteCmdlet()
 
         [Parameter(
             Mandatory = false,
-            HelpMessage = "List of tasks executed before schedule. e.g. [{'source' :'runbook', 'taskScope': 'Global', 'parameters': { 'arg1': 'value1'}}]")]
+            HelpMessage = "List of tasks executed before schedule. e.g. [{'source' :'runbook', 'taskScope': 'Global', 'parameters': { 'arg1': 'value1'}}]. This parameter is used to specify a command or script that should be run before the maintenance tasks are performed. This can be used to perform any necessary preparations or cleanup actions before the maintenance tasks are run. This parameter accepts a string value that specifies the command or script to be run. The command or script can be specified as a simple string or as an array of strings. If an array of strings is specified, each element in the array will be treated as a separate command or script.")]
         public string PreTask { get; set; }
 
         [Parameter(
             Mandatory = false,
-            HelpMessage = "List of tasks executed after schedule. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]")]
+            HelpMessage = "List of tasks executed after schedule. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]. This parameter is used to specify a command or script that should be run after the maintenance tasks are performed. This can be used to perform any necessary follow-up actions after the maintenance tasks are completed. This parameter accepts a string value that specifies the command or script to be run. The command or script can be specified as a simple string or as an array of strings. If an array of strings is specified, each element in the array will be treated as a separate command or script.")]
         public string PostTask { get; set; }
 
         [Parameter(

src/Maintenance/Maintenance/help/New-AzMaintenanceConfiguration.md

@@ -236,7 +236,7 @@ Accept wildcard characters: False
 ```
 
 ### -PreTask
-List of tasks executed before schedule. e.g. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]
+List of tasks executed before schedule. e.g. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]. This parameter is used to specify a command or script that should be run before the maintenance tasks are performed. This can be used to perform any necessary preparations or cleanup actions before the maintenance tasks are run. This parameter accepts a string value that specifies the command or script to be run. The command or script can be specified as a simple string or as an array of strings. If an array of strings is specified, each element in the array will be treated as a separate command or script.
 
 ```yaml
 Type: string
@@ -251,7 +251,7 @@ Accept wildcard characters: False
 ```
 
 ### -PostTask
-List of tasks executed after schedule. e.g. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]
+List of tasks executed after schedule. e.g. [{'source' :'runbook', 'taskScope': 'Resource', 'parameters': { 'arg1': 'value1'}}]. This parameter is used to specify a command or script that should be run after the maintenance tasks are performed. This can be used to perform any necessary follow-up actions after the maintenance tasks are completed. This parameter accepts a string value that specifies the command or script to be run. The command or script can be specified as a simple string or as an array of strings. If an array of strings is specified, each element in the array will be treated as a separate command or script.
 
 ```yaml
 Type: string