[whatwg/dom] DOM Comments don't align with HTML comments (#1023)

In the HTML spec, it says that comments must not contain `-->` among other things: https://html.spec.whatwg.org/multipage/syntax.html#comments

In the DOM spec, it says that you can create a `Comment` with any text, no restrictions: https://dom.spec.whatwg.org/#interface-comment

This was raised in a chrome issue where someone pointed out that you can create a `Comment` in script which contains a `-->`, put other things after the `-->`, and reassign `document.body.innerHTML = document.body.innerHTML` which will make everything after the `-->` get parsed as actual HTML instead of comments

@mfreed7 

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