Broken links in the Desktop runtime page

In the [Desktop apps](https://docs.deno.com/runtime/desktop/#what's-in-this-section) page, `Deno.BrowserWindow` and `Deno.autoUpdate()` results in 404:

> - [Windows](https://docs.deno.com/runtime/desktop/windows/): [`Deno.BrowserWindow`](https://docs.deno.com/api/deno/~/Deno.BrowserWindow) lifecycle, multiple windows, events.
> - [Auto-update](https://docs.deno.com/runtime/desktop/auto_update/): [`Deno.autoUpdate()`](https://docs.deno.com/api/deno/~/Deno.autoUpdate), manifests, bsdiff, rollback.

```
https://docs.deno.com/api/deno/~/Deno.BrowserWindow
https://docs.deno.com/api/deno/~/Deno.autoUpdate
```

Start with the Desktop apps page at docs.deno.com/runtime/desktop/ and inspect the Windows and Auto-update entries. Verify the two referenced API URLs, update the broken links to valid destinations, and confirm both links resolve without 404 errors.

Written by the indexing model from the issue text.