Fix typo

Fix typo by adding "a".

Author: tksh164

includes/disk-encryption-key-vault.md

@@ -149,7 +149,7 @@ Your key vault KEK URLs must be versioned. Azure enforces this restriction of ve
 
 ### Azure CLI
 
-Use the Azure CLI [`z keyvault key create`](/cli/azure/keyvault/key#az-keyvault-key-create) command to generate a new KEK and store it in your key vault.
+Use the Azure CLI [`az keyvault key create`](/cli/azure/keyvault/key#az-keyvault-key-create) command to generate a new KEK and store it in your key vault.
 
 ```azurecli-interactive
 az keyvault key create --name "myKEK" --vault-name "<your-unique-keyvault-name>" --kty RSA --size 4096
@@ -180,4 +180,4 @@ $KeyVault = Get-AzKeyVault -VaultName "<your-unique-keyvault-name>" -ResourceGro
 $KEK = Get-AzKeyVaultKey -VaultName "<your-unique-keyvault-name>" -Name "myKEK"
 
 Set-AzVMDiskEncryptionExtension -ResourceGroupName MyResourceGroup -VMName "MyVM" -DiskEncryptionKeyVaultUrl $KeyVault.VaultUri -DiskEncryptionKeyVaultId $KeyVault.ResourceId -KeyEncryptionKeyVaultId $KeyVault.ResourceId -KeyEncryptionKeyUrl $KEK.Id -SkipVmBackup -VolumeType All
- ```
+ ```