Page Anchor links do not have a discernable name

This markup causes a "links do not have a discernable name" error:

```html

Introducing: Ember Objects

This fix below works to put the text inside a link, but shipping it requires changes to styling. Since the headers become proper links, they need work to make them look like normal headers again.

In guides-article.js:

```js
for (var element of allHeaders) {
if (element.id) {
element.className = 'anchorable-toc'
let link = document.createElement('a');
link.className = 'toc-anchor';
link.href = `#${element.id}`;
link.innerText = element.textContent;
element.innerText = '';
element.appendChild(link, element.firstElementChild);
}
}
```

Results in

```html

Some Text