Add comments to article.md

I do not think it's likely but I do not want anyone to mistake those lines for legitimate JS expressions. I modified those two lines to match the format of pretty much every other comment in the article.
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Knox Jarvis 2021-02-04 18:24:48 -05:00 committed by GitHub
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@ -11,8 +11,8 @@ Document forms are members of the special collection `document.forms`.
That's a so-called "named collection": it's both named and ordered. We can use both the name or the number in the document to get the form.
```js no-beautify
document.forms.my - the form with name="my"
document.forms[0] - the first form in the document
document.forms.my; // the form with name="my"
document.forms[0] // the first form in the document
```
When we have a form, then any element is available in the named collection `form.elements`.