I only recently learned about a new feature to insert those fancy tags into your post.
I didn't know what the exact syntax was. It was only now that I needed it myself, and I've been searching like a crazy for it before I found that specific post here on meta.
It would be nice if this was reflected in the editing help.
And while we're at it, maybe also include this recently added feature (the ability to specify the language of your code blocks).