docs: add missing image (#18235)

docs/faq.md

@@ -197,4 +197,4 @@ Notice that just setting the background in the CSS does not have the desired eff
 [session-storage]: https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage
 [indexed-db]: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
 [browser-window]: api/browser-window.md
-[subpixel rendering example]: images/code_coverage_infra_diagram.png
+[subpixel rendering example]: images/subpixel-rendering-screenshot.gif