update invalidate docs to cover page endpoints (#4892)

Author: Rich-Harris

packages/kit/types/ambient.d.ts

@@ -106,7 +106,7 @@ declare module '$app/navigation' {
 		opts?: { replaceState?: boolean; noscroll?: boolean; keepfocus?: boolean; state?: any }
 	): Promise<void>;
 	/**
-	 * Causes any `load` functions belonging to the currently active page to re-run if they `fetch` the resource in question. Returns a `Promise` that resolves when the page is subsequently updated.
+	 * Causes any `load` functions belonging to the currently active page to re-run if they `fetch` the resource in question, or re-fetches data from a page endpoint if the invalidated resource is the page itself. Returns a `Promise` that resolves when the page is subsequently updated.
 	 * @param dependency The invalidated resource
 	 */
 	export function invalidate(dependency: string | ((href: string) => boolean)): Promise<void>;