I've amended the section in question with a few further alterations. I still think the section needs work and will continue to work on it myself. My main reasons for putting the section in now is that the original section was primarily concerned with: a) the "say/show" distinction, which I think plays little or no part in the Investigations; and b) a formal distinction between sense and nonsense which is much less explicit in the Investigations (if there at all) than it is in the Tractatus.