/Docs Like Code/ reads more like a reference than a cohesive introduction to using asynchronous methods of producing technical documentation. The focus is also a bit more on the "process" side, which is currently contentious in the tech writing world (versus focus on content), but there's room for both. Honestly, I think this book is probably worth a read--it's extremely short--but you're going to need a lot more than this book to even begin to understand the process as it is applied online. Really, though, it's not too far off from the writing process we've identified for centuries: Write, Review (revise), Test (peer review), Merge (add to existing work from others), Build and Deploy (Publish), repeat the results. The biggest difference is in the speed at which this all happens now.
Again, worth a read for technical writing folk, but needs a lot more to make a rel impact.