doc: list connector_enforcement options. (#12456) (#20616)

[upstream:849f8f2e3c558be3533ba04f526fc9640b9a90f3]

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

.changelog/12456.txt

@@ -0,0 +1,2 @@
+```release-note:none
+```

website/docs/r/sql_database_instance.html.markdown

@@ -316,7 +316,7 @@ The `settings` block supports:
 
 * `collation` - (Optional) The name of server instance collation.
 
-* `connector_enforcement` - (Optional) Enables the enforcement of Cloud SQL Auth Proxy or Cloud SQL connectors for all the connections. If enabled, all the direct connections are rejected.
+* `connector_enforcement` - (Optional) Control the enforcement of Cloud SQL Auth Proxy or Cloud SQL connectors for all the connections, can be `REQUIRED` or `NOT_REQUIRED`. If enabled, all the direct connections are rejected.
 
 * `deletion_protection_enabled` - (Optional) Enables deletion protection of an instance at the GCP level. Enabling this protection will guard against accidental deletion across all surfaces (API, gcloud, Cloud Console and Terraform) by enabling the [GCP Cloud SQL instance deletion protection](https://cloud.google.com/sql/docs/postgres/deletion-protection). Terraform provider support was introduced in version 4.48.0. Defaults to `false`.
 
@@ -687,4 +687,4 @@ $ terraform import google_sql_database_instance.default {{name}}
 ~> **NOTE:** Some fields (such as `replica_configuration`) won't show a diff if they are unset in
 config and set on the server.
 When importing, double-check that your config has all the fields set that you expect- just seeing
-no diff isn't sufficient to know that your config could reproduce the imported resource.
+no diff isn't sufficient to know that your config could reproduce the imported resource.