Update article.md

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@ -195,7 +195,7 @@ For instance, here `<head>` and `<body>` are siblings:
- `<body>` is said to be the "next" or "right" sibling of `<head>`,
- `<head>` is said to be the "previous" or "left" sibling of `<body>`.
The next sibling is is `nextSibling`, and the previous one is `previousSibling`.
The next sibling is `nextSibling`, and the previous one is `previousSibling`.
The parent is available as `parentNode`.