So I don’t reach this conclusion from that sentence. The point of that sentence from the devguide is to say, e.g. “if you’re making a semantic change for import.c don’t go tweaking indentation in warnings.c at the same time if that’s all you’re doing to warnings.c.” It isn’t meant to suggest that fixing comments to be correct is not allowed on its own. (And please feel free to tweak the wording as necessary to communicate that).