Re: [whatwg/dom] Suggestion: `Node.insertAfter(newNode, referenceNode)` (#986)

@isiahmeadows thanks for clarifying, then maybe the proposal text should be updated ... but to be sure we're on the same page:

```html
<ul id="list">
  <li>first task</li>
  <!-- come comment -->
</ul>
```

Assuming a new item such as:

```js
const task = document.createElement('li');
task.textContent = 'last task';
```

### list.insertAfter(task, null)

would produce:
```html
<ul id="list">
  <li>first task</li>
  <!-- come comment -->
  <li>last task</li>
</ul>
```

while ...

### list.insertAfter(task, list.lastElementChild)

would produce:
```html
<ul id="list">
  <li>first task</li>
  <li>last task</li>
  <!-- come comment -->
</ul>
```

did I get it right?

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