remove reference to non existing field in description for key managem…

…ent service property

website/docs/r/kubernetes_cluster.html.markdown

@@ -494,7 +494,7 @@ An `identity` block supports the following:
 
 A `key_management_service` block supports the following:
 
-* `key_vault_key_id` - (Required) Identifier of Azure Key Vault key. See [key identifier format](https://learn.microsoft.com/en-us/azure/key-vault/general/about-keys-secrets-certificates#vault-name-and-object-name) for more details. When Azure Key Vault key management service is enabled, this field is required and must be a valid key identifier. When `enabled` is `false`, leave the field empty.
+* `key_vault_key_id` - (Required) Identifier of Azure Key Vault key. See [key identifier format](https://learn.microsoft.com/en-us/azure/key-vault/general/about-keys-secrets-certificates#vault-name-and-object-name) for more details.
 
 * `key_vault_network_access` - (Optional) Network access of the key vault Network access of key vault. The possible values are `Public` and `Private`. `Public` means the key vault allows public access from all networks. `Private` means the key vault disables public access and enables private link. Defaults to `Public`.