I agree with shmem that a default line or two to prime the pump and point to the formating suggestions would be a Good Idea(tm). I also agree with ambrus that the proposed text is too abrasive. I could get behind something like "If you preview the text and things don't look right, see Writeup Formatting Tips for further suggestions."

One of the big draws for the Monastery is our collegiality. Even in the middle of an ugly flame-fest, folks are mostly polite and civil to each other (baring the occasional Anonymous Monk, of course). I get enough gratuitous rudeness at work during the course of the day, let's not import Bad Ideas From Outside unless we have absolutely tried anything else.