Most WIP pages have one, if you can’t find a better one, you can look at mine: The Realm of Steel 11/8/20 Demo Update (Poll post 85)
Mine is kind of long and over explained, but it serves its purpose. A shorter one works too.
Also, I always do a short post with just a general overview of the update, then a more comprehensive edit for the update log. Like @fisheye, I prefer a post than searching through the update log, so I would say do both.