sync docs to createIndexFiles (#3617)

.changeset/modern-pillows-beam.md

@@ -2,4 +2,4 @@
 '@sveltejs/kit': patch
 ---
 
-add prerender.subfolders setting
+add `prerender.createIndexFiles` option

documentation/docs/14-configuration.md

@@ -53,8 +53,8 @@ const config = {
 		prerender: {
 			concurrency: 1,
 			crawl: true,
+			createIndexFiles: true,
 			enabled: true,
-			subfolders: true,
 			entries: ['*'],
 			onError: 'fail'
 		},
@@ -195,9 +195,9 @@ See [Prerendering](#page-options-prerender). An object containing zero or more o
 
 - `concurrency` — how many pages can be prerendered simultaneously. JS is single-threaded, but in cases where prerendering performance is network-bound (for example loading content from a remote CMS) this can speed things up by processing other tasks while waiting on the network response
 - `crawl` — determines whether SvelteKit should find pages to prerender by following links from the seed page(s)
+- `createIndexFiles` - if set to `false`, will render `about.html` instead of `about/index.html`
 - `enabled` — set to `false` to disable prerendering altogether
 - `entries` — an array of pages to prerender, or start crawling from (if `crawl: true`). The `*` string includes all non-dynamic routes (i.e. pages with no `[parameters]` )
-- `subfolders` - set to `false` to disable subfolders for routes: instead of `about/index.html` render `about.html`
 - `onError`
 
   - `'fail'` — (default) fails the build when a routing error is encountered when following a link

packages/kit/CHANGELOG.md

@@ -6,7 +6,7 @@
 
 - Move config.kit.hydrate and config.kit.router to config.kit.browser ([#3578](https://github.com/sveltejs/kit/pull/3578))
 
-* add prerender.subfolders setting ([#2632](https://github.com/sveltejs/kit/pull/2632))
+* add `prerender.createIndexFiles` option ([#2632](https://github.com/sveltejs/kit/pull/2632))
 
 ## 1.0.0-next.249