[whatwg/dom] Explicitly update the child's parent (Issue #1221)

In the current specification, updating a child's parent reference is implicit and does not seem to be described anywhere.

For example, in [appendChild](https://dom.spec.whatwg.org/#dom-node-appendchild), the parent's children are explicitly modified by [insert](https://dom.spec.whatwg.org/#concept-node-insert).

> 2. If child is null, then append node to parent's children.
> 3. Otherwise, insert node into parent's children before child's index.

Somewhere before or after this, the appended node's parent reference should also be updated, but this is implicit.

When is the appropriate time for this?

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