Update article.md

Take 2 on 'There should be "loading" indications...." line.
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@ -191,7 +191,7 @@ Please note that if you're using `defer`, then the page is visible *before* the
So the user may read the page, but some graphical components are probably not ready yet.
There should be "loading" indications in the proper places, and not-working buttons should be visually disabled, to clearly show the user what's ready and what's not.
There should be "loading" indications in the proper places, and disabled buttons should show as such, so the user can clearly see what's ready and what's not.
```
In practice, `defer` is used for scripts that need the whole DOM and/or their relative execution order is important. And `async` is used for independent scripts, like counters or ads. And their relative execution order does not matter.