Even worse than that, it's not the LLM, it's the operator. Mimicking your own style given a corpus is the lowest possible bar - you can also select among the great writers (technical or not) from history and have it give you eerily correct stylistic cues. Try Hemingway or Mark Twain next time you feel like generating a doc. Benjamin Franklin if you're feeling particularly Poor Richard.

There's no reason any more to read bad documentation. You can feed any docs in and get them in the precise style you want, so don't impose bad prose on others in your repos. Pick a solid technical writing base, jargon free, and go from there. I sometimes generate architecture proposals from the llm in RFC format and it's word perfect.