And I speak of this because I'm one of those who can't write well. The philosophy I've always had was that someone would eventually come along, take a look at the crap you wrote and fix it. A novel concept, but I've seen it in action. I try to write documentation well enough, but it is clearly fascinating skill others have to clear issues up and make words and paragraphs look pretty. Organization is key I think. By placing code in certain places, you can give context to paragraphs in a way that just blows the mind.
What I mean is that even if you may not think what you write would help someone, there are enough people that might stumble upon the code to correct the wording. The key with writing documentation is to write well enough for most people to understand what you are trying to get across so that someone who wishes to play editor may do so accurately.