[AppService]: doc-update #12181- AppSettingsOverrides in New-AzWebAppSlot are ignored (#20606)

* [AppService]: doc-update #12181- AppSettingsOverrides in New-AzWebAppSlot are ignored

* Review comments are addressed

Author: Kotasudhakarreddy

src/Websites/Websites/Cmdlets/DeploymentSlots/NewAzureWebAppSlot.cs

@@ -65,7 +65,7 @@ public class NewAzureWebAppSlotCmdlet : WebAppBaseClientCmdLet
         [ValidateNotNullOrEmpty]
         public SwitchParameter IgnoreCustomHostNames { get; set; }
 
-        [Parameter(Position = 8, Mandatory = false, HelpMessage = "Overrides all application settings in new web app")]
+        [Parameter(Position = 8, Mandatory = false, HelpMessage = "Overrides all application settings in new web app. It works only with SourceWebApp parameter")]
         [ValidateNotNullOrEmpty]
         public Hashtable AppSettingsOverrides { get; set; }
 

src/Websites/Websites/Cmdlets/WebApps/NewAzureWebApp.cs

@@ -115,7 +115,7 @@ public class NewAzureWebAppCmdlet : WebAppBaseClientCmdLet
         [ValidateNotNullOrEmpty]
         public SwitchParameter IgnoreCustomHostNames { get; set; }
 
-        [Parameter(Position = 6, Mandatory = false, HelpMessage = "Overrides all application settings in new web app", ParameterSetName = CopyWebAppParameterSet)]
+        [Parameter(Position = 6, Mandatory = false, HelpMessage = "Overrides all application settings in new web app. It works only with SourceWebApp parameter", ParameterSetName = CopyWebAppParameterSet)]
         [ValidateNotNullOrEmpty]
         public Hashtable AppSettingsOverrides { get; set; }
 

src/Websites/Websites/help/New-AzWebApp.md

@@ -73,7 +73,7 @@ Accept wildcard characters: False
 ```
 
 ### -AppSettingsOverrides
-App Settings Overrides HashTable
+App Settings Overrides HashTable. It works only with SourceWebApp parameter.
 
 ```yaml
 Type: System.Collections.Hashtable

src/Websites/Websites/help/New-AzWebAppSlot.md

@@ -56,7 +56,7 @@ Accept wildcard characters: False
 ```
 
 ### -AppSettingsOverrides
-App Settings Overrides Hashtable
+App Settings Overrides Hashtable. It works only with SourceWebApp parameter.
 
 ```yaml
 Type: System.Collections.Hashtable