Document rate_limiting configuration option (#9833)

contents/docs/libraries/js/index.mdx

@@ -499,6 +499,7 @@ Some of the most relevant options are:
 | `persistence`<br/><br/>**Type:** `localStorage` or `sessionStorage` or `cookie` or `memory` or `localStorage+cookie`<br/>**Default:** `cookie`                                            | Determines how PostHog stores information about the user. See [persistence](#persistence) for details.                         |
 | `property_denylist`<br/><br/>**Type:** Array<br/>**Default:** `[]`                                                                                                                        | A list of properties that should never be sent with `capture` calls.                                                           |
 | `person_profiles`<br /><br />**Type:** Enum: `always`, `identified_only`<br/>**Default:** `always`                                                                                | Set whether events should capture identified events and process person profiles |
+| `rate_limiting`<br/><br/>**Type:** Object<br/>**Default:** `{ events_per_second: 10, events_burst_limit: events_per_second * 10 }`                                                        | Controls event rate limiting to help you avoid accidentally sending too many events. `events_per_second` determines how many events can be sent per second on average (default: 10). `events_burst_limit` sets the maximum events that can be sent at once (default: 10 times the `events_per_second` value). |
 | `sanitize_properties`<br/><br/>**Type:** Function<br/>**Default:** `null`                                                                                                                 | A function that allows you to sanitize or modify the properties that get sent. Example: `sanitize_properties: function(properties, event) { if(properties['$ip']) { properties['$ip'] = null } return properties }` |
 | `session_recording`<br/><br/>**Type:** Object<br/>**Default:** [See here.](https://github.com/PostHog/posthog-js/blob/96fa9339b9c553a1c69ec5db9d282f31a65a1c25/src/posthog-core.js#L1032) | Configuration options for recordings. More details [found here](/docs/session-replay/manual)         |
 | `session_idle_timeout_seconds`<br/><br/>**Type:** Integer<br/>**Default:** `1800`                                                                                                         | The maximum amount of time a session can be inactive before it is split into a new session.                                    |