docs: update error code for too many requests

- Change error code 429 from 'forbidden' to 'tooManyRequests'
- This update improves clarity and aligns with standard HTTP status code descriptions

Author: fulleni

src/content/docs/api-server/architecture/error-handling.mdx

@@ -34,7 +34,7 @@ The following table lists the most common error codes and their corresponding HT
 | `403`       | `forbidden`            | The authenticated user does not have the necessary permissions to perform the requested action.           |
 | `404`       | `notFound`             | The requested resource (e.g., an item with a specific ID) could not be found.                           |
 | `409`       | `conflict`             | The request could not be completed due to a conflict with the current state of the resource.            |
-| `429`       | `forbidden`            | The request was rejected because the client has exceeded the rate limit.                                |
+| `429`       | `tooManyRequests`            | The request was rejected because the client has exceeded the rate limit.                                |
 | `500`       | `serverError`          | A generic error occurred on the server.                                                                 |
 | `500`       | `operationFailed`      | A specific, known operation failed on the server for an unexpected reason.                              |
 | `500`       | `unknownError`         | An unexpected and unhandled error occurred on the server.                                               |