Sync kit docs (#1628)

sync kit docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/kit/98-reference/10-@sveltejs-kit.md

@@ -2357,7 +2357,10 @@ type RemoteForm<
 	): RemoteForm<Input, Output>;
 	/** Validate the form contents programmatically */
 	validate(options?: {
+		/** Set this to `true` to also show validation issues of fields that haven't been touched yet. */
 		includeUntouched?: boolean;
+		/** Set this to `true` to only run the `preflight` validation. */
+		preflightOnly?: boolean;
 		/** Perform validation as if the form was submitted by the given button. */
 		submitter?: HTMLButtonElement | HTMLInputElement;
 	}): Promise<void>;
@@ -2459,6 +2462,37 @@ type RemoteFormFieldValue =
 
 </div>
 
+## RemoteFormFields
+
+Recursive type to build form fields structure with proxy access
+
+<div class="ts-block">
+
+```dts
+type RemoteFormFields<T> =
+	WillRecurseIndefinitely<T> extends true
+		? RecursiveFormFields
+		: NonNullable<T> extends
+					| string
+					| number
+					| boolean
+					| File
+			? RemoteFormField<NonNullable<T>>
+			: T extends string[] | File[]
+				? RemoteFormField<T> & {
+						[K in number]: RemoteFormField<T[number]>;
+					}
+				: T extends Array<infer U>
+					? RemoteFormFieldContainer<T> & {
+							[K in number]: RemoteFormFields<U>;
+						}
+					: RemoteFormFieldContainer<T> & {
+							[K in keyof T]-?: RemoteFormFields<T[K]>;
+						};
+```
+
+</div>
+
 ## RemoteFormInput
 
 <div class="ts-block">