It's not strictly from the technical writing corner, but I've learned a lot from the book "The Craft of Scientific Writing" by Micheal Allay. It's more geared t

It's not strictly from the technical writing corner, but I've learned a lot from the book "The Craft of Scientific Writing" by Micheal Allay. It's more geared towards scientific papers, but I've found the style papers are structured to be a very useful starting point for design documents and runbooks. I tend to start with something like that, and adjust it according to the audience.