Update documentation for event payload (#13591)

Author: Litarnus

develop-docs/sdk/data-model/event-payloads/sdk.mdx

@@ -69,6 +69,14 @@ activated integrations. Each package consists of a `name` in the format
 `identifier` should be a checkout link and the `version` should be a Git
 reference (branch, tag or SHA).
 
+`settings`
+
+: _Optional_. A collection of settings that are used to control behaviour.
+- `infer_ip`: Controls the behaviour of IP address inferrence based on request information. Following values are allowed:
+  - `auto`: infer the IP address based on available request information. This is equal to [setting the IP address to `{{auto}}`](https://develop.sentry.dev/sdk/data-model/event-payloads/user/#automatic-ip-addresses).
+  - `never`: Do not infer the IP address from the request. This is the default if an invalid value for `infer_ip` was sent.
+  - `legacy`: Infer the IP address only if the value is `{{auto}}`. For Javascript and Cocoa it will also infer if `ip_address` is empty. This is the default if no value was sent.
+
 ## Example
 
 The following example illustrates the SDK part of the <Link to="/sdk/data-model/event-payloads/">event payload</Link> and omits other
@@ -90,7 +98,10 @@ attributes for simplicity.
         "name": "git:https://github.com/getsentry/sentry-cocoa.git",
         "version": "4.1.0"
       }
-    ]
+    ],
+    "settings": {
+      "infer_ip": "auto"
+    }
   }
 }
 ```