It’s correct in the prose docs, and there’s no docstring where this function is defined. It seems its inherited from the docstring of the C implementation of the BufferedIOBase.read() function, from which the HTTPResponse class ultimately inherits.
However, that docstring is presumably generic for multiple functions (in fact, I’ve seen and edited similar variations elsewhere), I would think it shouldn’t be touched there, and instead the HTTPResponse.read() function given a more specifically-tailored docstring of its own including the fix, unless there’s a reason not to do so.