Protected containers: Add DELETE REST API for container protection rules

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Issue #457518

Changelog: added

doc/api/project_container_registry_protection_rules.md

@@ -171,10 +171,10 @@ DELETE /api/v4/projects/:id/registry/protection/rules/:protection_rule_id
 
 Supported attributes:
 
-| Attribute                     | Type            | Required | Description                    |
-|-------------------------------|-----------------|----------|--------------------------------|
-| `id`                          | integer/string  | Yes      | ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding) owned by the authenticated user. |
-| `protection_rule_id`          | integer         | Yes      | ID of the container registry protection rule to be deleted. |
+| Attribute            | Type           | Required | Description |
+|----------------------|----------------|----------|-------------|
+| `id`                 | integer/string | Yes      | ID or [URL-encoded path of the project](rest/index.md#namespaced-path-encoding) owned by the authenticated user. |
+| `protection_rule_id` | integer        | Yes      | ID of the container registry protection rule to be deleted. |
 
 If successful, returns [`204 No Content`](rest/index.md#status-codes).