We're being needlessly cheeky here. It isn't on every page and it isn't on the pdf. I propose it's an accident which happend when the document was moved from Wo

We're being needlessly cheeky here. It isn't on every page and it isn't on the pdf. I propose it's an accident which happend when the document was moved from Word to the web. Notice the comma makes sense in How to Write Clear, Concise, and Direct Sentences. They just removed and Direct to shorten the title and someone, not necessarily the authors, mistakenly left the comma.