Where's the markdown reference? I am not looking for keyboard shortcuts. It seems there's more than the icons. The FAQ page should have a link to it.
Click on the orange ? button, that should bring up a link to advanced help.
That links takes you to: http://stackoverflow.com/editing-help
If you are a new user, you won't even have to click on the ? button; it's already expanded.
But I do agree that there should be a link to that page somewhere in the FAQ.