You're going off on a tangent. The question wasn't "is it harder to figure out what the code does by reading it than reading well written documentation?", it w

You're going off on a tangent. The question wasn't "is it harder to figure out what the code does by reading it than reading well written documentation?", it was "how can you submit a pull request for documentation when there’s no documentation for you to understand the code with", and the obvious answer is: by reading the code—in fact, that's ongoing work by some of the project's contributors.