[whatwg/dom] Proposal: ParentNode#append() to return self (#348)

A minor quality of life change that would allow changing this:

```js
function createFoo(bar) {
    let foo = document.createElement('div');
    foo.append('Inside foo', bar);
    return foo;
}
```

Into:

```js
function createFoo(bar) {
    return document.createElement('div').append('Inside foo', bar);
}
```

This would also make it easier for transpiler authors to target the bare-bones DOM API with syntax like JSX or similar.

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