Add docs for form/useSubmit navigate/fetcherKey

docs/components/form.md

@@ -197,6 +197,14 @@ function Project() {
 
 As you can see, both forms submit to the same route but you can use the `request.method` to branch on what you intend to do. After the actions completes, the `loader` will be revalidated and the UI will automatically synchronize with the new data.
 
+## `navigate`
+
+You can tell the form to skip the navigation and use a [fetcher][usefetcher] internally by specifying `<Form navigate={false}>`. This is essentially a shorthand for `useFetcher()` + `<fetcher.Form>` where you don't care about the resulting data and only want to kick off a submission and access the pending state via [`useFetchers()`][usefetchers].
+
+## `fetcherKey`
+
+When using a non-navigating `Form`, you may also optionally specify your own fetcher key to use via `<Form navigate={false} fetcherKey="my-key">`.
+
 ## `replace`
 
 Instructs the form to replace the current entry in the history stack, instead of pushing the new entry.
@@ -367,6 +375,7 @@ You can access those values from the `request.url`
 [useactiondata]: ../hooks/use-action-data
 [formdata]: https://developer.mozilla.org/en-US/docs/Web/API/FormData
 [usefetcher]: ../hooks/use-fetcher
+[usefetchers]: ../hooks/use-fetchers
 [htmlform]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form
 [htmlformaction]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form#attr-action
 [htmlform-method]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form#attr-method

docs/hooks/use-submit.md

@@ -150,7 +150,15 @@ submit(null, {
 <Form action="/logout" method="post" />;
 ```
 
-Because submissions are navigations, the options may also contain the other navigation related props from [`<Form>`][form] such as `replace`, `state`, `preventScrollReset`, `relative`, `unstable_viewTransition` etc.
+Because submissions are navigations, the options may also contain the other navigation related props from [`<Form>`][form] such as:
+
+- `fetcherKey`
+- `navigate`
+- `preventScrollReset`
+- `relative`
+- `replace`
+- `state`
+- `unstable_viewTransition`
 
 [pickingarouter]: ../routers/picking-a-router
 [form]: ../components/form