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I think this is a good change, if it helps people to understand that there is such a thing as valid HTML and CSS as opposed to "street HTML". Having done some (ahem) REAL coding in my life before the web, I was a bit confused about the apparent looseness of HTML when I first began learning it. It was a few years before I grokked what the W3C was up to.
The line is blurry, because if you consider HTML as a file format created by software(WYsIWYG editors) for software(browsers), then it is the same as a document (created by word, viewed by openoffice). But if you are talking from the developer's standpoint, generally you write the HTML yourself, so you can refer to it as code.