Fix incorrect guidance on enabling EventRateLimit

Author: pjbgf

content/en/docs/reference/access-authn-authz/admission-controllers.md

@@ -202,8 +202,6 @@ is recommended instead.
 This admission controller mitigates the problem where the API server gets flooded by
 event requests. The cluster admin can specify event rate limits by:
 
- * Ensuring that `eventratelimit.admission.k8s.io/v1alpha1=true` is included in the
-   `--runtime-config` flag for the API server;
  * Enabling the `EventRateLimit` admission controller;
  * Referencing an `EventRateLimit` configuration file from the file provided to the API
    server's command line flag `--admission-control-config-file`: