{DesktopVitualization} Fix Azure#20307: Update examples and add default values (Azure#20322)

Fixes Azure#20307

Co-authored-by: NanxiangLiu <[email protected]>

Author: RakeshMohanMSFT

src/DesktopVirtualization/help/New-AzWvdHostPool.md

@@ -53,14 +53,7 @@ New-AzWvdHostPool -ResourceGroupName ResourceGroupName `
                             -Description 'Description' `
                             -FriendlyName 'Friendly Name' `
                             -MaxSessionLimit 5 `
-                            -VMTemplate $null `
-                            -SsoClientId $null `
-                            -SsoClientSecretKeyVaultPath $null `
-                            -SsoSecretType $null `
-                            -SsoadfsAuthority $null `
-                            -CustomRdpProperty $null `
-                            -Ring $null `
-                            -ValidationEnvironment:$false
+                            -PreferredAppGroupType 'Desktop' `
 ```
 
 ```output
@@ -83,14 +76,7 @@ New-AzWvdHostPool -ResourceGroupName ResourceGroupName `
                             -Description 'Description' `
                             -FriendlyName 'Friendly Name' `
                             -MaxSessionLimit 5 `
-                            -VMTemplate $null `
-                            -SsoClientId $null `
-                            -SsoClientSecretKeyVaultPath $null `
-                            -SsoSecretType $null `
-                            -SsoadfsAuthority $null `
-                            -CustomRdpProperty $null `
-                            -Ring $null `
-                            -ValidationEnvironment:$false
+                            -PreferredAppGroupType 'Desktop' `
 ```
 
 ```output
@@ -443,7 +429,7 @@ Accept wildcard characters: False
 ```
 
 ### -PreferredAppGroupType
-The type of preferred application group type, default to Desktop Application Group
+The type of preferred application group type. Accepted Values: Desktop, RailApplications
 
 ```yaml
 Type: Microsoft.Azure.PowerShell.Cmdlets.DesktopVirtualization.Support.PreferredAppGroupType
@@ -643,7 +629,7 @@ Accept wildcard characters: False
 ```
 
 ### -SsoSecretType
-The type of single sign on Secret Type.
+The type of single sign on Secret Type. Accepted Values: Certificate, CertificateInKeyVault, SharedKey, SharedKeyInKeyVault	
 
 ```yaml
 Type: Microsoft.Azure.PowerShell.Cmdlets.DesktopVirtualization.Support.SsoSecretType