Update docs

Author: brophdawg11

docs/hooks/use-fetcher.md

@@ -203,6 +203,8 @@ function TaskCheckbox({ task }) {
 }
 ```
 
+If you opt-out of serialization using `encType:null`, then `fetcher.formData` will be `undefined` and your data will be exposed on `fetcher.payload`.
+
 ## `fetcher.formAction`
 
 Tells you the action url the form is being submitted to.
@@ -227,6 +229,10 @@ fetcher.formMethod; // "post"
 
 <docs-warning>The `fetcher.formMethod` field is lowercase without the `future.v7_normalizeFormMethod` [Future Flag][api-development-strategy]. This is being normalized to uppercase to align with the `fetch()` behavior in v7, so please upgrade your React Router v6 applications to adopt the uppercase HTTP methods.</docs-warning>
 
+## `fetcher.payload`
+
+Any POST, PUT, PATCH, or DELETE that started from a `fetcher.submit(payload, { encType: null })` will have your `payload` value represented in `fetcher.payload`.
+
 [loader]: ../route/loader
 [action]: ../route/action
 [pickingarouter]: ../routers/picking-a-router

docs/hooks/use-navigation.md

@@ -91,11 +91,13 @@ let isRedirecting =
 
 Any POST, PUT, PATCH, or DELETE navigation that started from a `<Form>` or `useSubmit` will have your form's submission data attached to it. This is primarily useful to build "Optimistic UI" with the `submission.formData` [`FormData`](https://developer.mozilla.org/en-US/docs/Web/API/FormData) object.
 
+If you opt-out of serialization using `encType:null`, then `navigation.formData` will be `undefined` and your data will be exposed on `navigation.payload`.
+
 In the case of a GET form submission, `formData` will be empty and the data will be reflected in `navigation.location.search`.
 
 ## `navigation.payload`
 
-Any POST, PUT, PATCH, or DELETE navigation that started from a `useSubmit(payload, { encType: null })` will have your `payload` value represented on the navigation.
+Any POST, PUT, PATCH, or DELETE navigation that started from a `useSubmit(payload, { encType: null })` will have your `payload` value represented in `navigation.payload`.
 
 ## `navigation.location`