docs: Use inline image link in faq.md (#35647)

* Use absolute URL in faq.md image link

The relative link is rendered relative to the host domain, which works fine when viewing it on Github, but since you also use the same generated HTML in your doc site, the link is broken. See here: https://www.electronjs.org/docs/latest/faq#the-font-looks-blurry-what-is-this-and-what-can-i-do

Using an absolute URL here should fix the issue on the main site.

* Use inline image reference for subpixel rendering example

As suggested by @dsanders11

Co-authored-by: Adrian Petrescu <adrian@apetre.sc>

docs/faq.md

@@ -135,7 +135,7 @@ is only available in renderer processes.
 
 If [sub-pixel anti-aliasing](https://alienryderflex.com/sub_pixel/) is deactivated, then fonts on LCD screens can look blurry. Example:
 
-![subpixel rendering example]
+![Subpixel rendering example](images/subpixel-rendering-screenshot.gif)
 
 Sub-pixel anti-aliasing needs a non-transparent background of the layer containing the font glyphs. (See [this issue](https://github.com/electron/electron/issues/6344#issuecomment-420371918) for more info).
 
@@ -161,4 +161,3 @@ Notice that just setting the background in the CSS does not have the desired eff
 [indexed-db]: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
 [message-port]: https://developer.mozilla.org/en-US/docs/Web/API/MessagePort
 [browser-window]: api/browser-window.md
-[subpixel rendering example]: images/subpixel-rendering-screenshot.gif