I remember reading somewhere in the SE help wikis (I'll try to dig it up when I get a chance. If anyone else knows where it is already, please post it.) about "support answers". I can't remember the actual term, but the concept has stuck with me.
I am referring to an answer that (in my own wording) isn't quite enough if it were to stand alone, but when provided alongside another answer, fills in important gaps where needed, and adds context which makes the original more helpful in some way.
The consensus was that these were/ are valid answers, with users being encouraged to provide them where needed.
This is how I usually react in situations like the one above. I give a secondary answer, but I make sure that the very first sentence / paragraph informs the reader about the answer's purpose. I also make sure, in the same breath, to point the reader toward the answer to which I am adding.
In this situation, this seems like the best solution to me, as answers like the original above are little more than words to many (most?) if the poster doesn't try to explain, or link an explanation to, terms like
kiosk mode. To anyone who has never heard of that term, the answer would have been worthless.
However, I wouldn't feel comfortable editing info like that into another users post, because there is always the possibility that I do not understand the concepts being discussed as well as I think I do. There have been times when I was certain of an answer, only to find out later that I had completely misinterpreted the question. The result is embarrassing enough when it is my own name at the bottom of the post. This is the main reason that I do not try to alter content in another user's answer, unless it cannot be avoided. I am good enough at embarrassing myself. I don't need any help.