docs: removes outdated rateLimit option (#11291)

### What?

This PR removes references to the `rateLimit` option from the
documentation, as it was deprecated in Payload v3.

Since Payload now runs on Next.js, which are often deployed
serverlessly, built-in rate limiting is no longer supported.

Users are encouraged to implement rate limiting at the load balancer,
proxy level, or use services like Cloudflare.

Fixes #10321

Author: PatrikKozak

docs/configuration/overview.mdx

@@ -90,7 +90,6 @@ The following options are available:
 | **`onInit`**               | A function that is called immediately following startup that receives the Payload instance as its only argument.                                                                                                             |
 | **`debug`**                | Enable to expose more detailed error information.                                                                                                                                                                            |
 | **`telemetry`**            | Disable Payload telemetry by passing `false`. [More details](#telemetry).                                                                                                                                                    |
-| **`rateLimit`**            | Control IP-based rate limiting for all Payload resources. Used to prevent DDoS attacks, etc. [More details](../production/preventing-abuse#rate-limiting-requests).                                                          |
 | **`hooks`**                | An array of Root Hooks. [More details](../hooks/overview).                                                                                                                                                                   |
 | **`plugins`**              | An array of Plugins. [More details](../plugins/overview).                                                                                                                                                                    |
 | **`endpoints`**            | An array of Custom Endpoints added to the Payload router. [More details](../rest-api/overview#custom-endpoints).                                                                                                             |