[Az.KeyVault] Add help example title for Import-AzKeyVaultSecurityDomain (#22831)

* Add help example title

* Update src/KeyVault/KeyVault/help/Import-AzKeyVaultSecurityDomain.md

---------

Co-authored-by: Beisi Zhou <[email protected]>

Author: NoriZC

src/KeyVault/KeyVault/SecurityDomain/Cmdlets/ImportAzKeyVaultSecurityDomain.cs

@@ -1,4 +1,5 @@
 using Microsoft.Azure.Commands.Common.Authentication;
+using Microsoft.Azure.Commands.Common.Exceptions;
 using Microsoft.Azure.Commands.KeyVault.Models;
 using Microsoft.Azure.Commands.KeyVault.Properties;
 using Microsoft.Azure.Commands.KeyVault.SecurityDomain.Common;
@@ -159,11 +160,11 @@ private void ValidateParameters()
         {
             if (Keys.Length < 2)
             {
-                throw new ArgumentException(string.Format(Resources.RestoreSecurityDomainNotEnoughKey, Common.Constants.MinQuorum));
+                throw new AzPSArgumentException(string.Format(Resources.RestoreSecurityDomainNotEnoughKey, Common.Constants.MinQuorum), nameof(Keys));
             }
             if (Keys.Any(key => string.IsNullOrEmpty(key.PublicKey) || string.IsNullOrEmpty(key.PrivateKey)))
             {
-                throw new ArgumentException(Resources.RestoreSecurityDomainBadKey);
+                throw new AzPSArgumentException(Resources.RestoreSecurityDomainBadKey, nameof(Keys));
             }
         }
 

src/KeyVault/KeyVault/help/Import-AzKeyVaultSecurityDomain.md

@@ -52,7 +52,7 @@ This cmdlet imports previously exported security domain data to a managed HSM.
 
 ## EXAMPLES
 
-### Example 1
+### Example 1: Import Security domain
 ```powershell
 $keys = @{PublicKey = "sd1.cer"; PrivateKey = "sd1.key"}, @{PublicKey = "sd2.cer"; PrivateKey = "sd2.key"}, @{PublicKey = "sd3.cer"; PrivateKey = "sd3.key"}
 Import-AzKeyVaultSecurityDomain -Name testmhsm -Keys $keys -SecurityDomainPath sd.ps.json
@@ -61,7 +61,7 @@ Import-AzKeyVaultSecurityDomain -Name testmhsm -Keys $keys -SecurityDomainPath s
 First, the keys need be provided to decrypt the security domain data.
 Then, The **Import-AzKeyVaultSecurityDomain** command restores previous backed up security domain data to a managed HSM using these keys.
 
-### Example 2
+### Example 2: Import Security domain by separate steps 
 ```powershell
 $exchangeKeyOutputPath = "ExchangeKey.cer"
 $SecurityDomainRestoredBlob = "HsmRestoreBlob.json"