build(python): fix docs and docfx builds#418

cojenco merged 2 commits intomaingoogleapis/google-resumable-media-python:mainfrom

owl-bot-update-lock-5ea6d0ab82c956b50962f91d94e206d3921537ae5fe1549ec5326381d8905cfagoogleapis/google-resumable-media-python:owl-bot-update-lock-5ea6d0ab82c956b50962f91d94e206d3921537ae5fe1549ec5326381d8905cfaCopy head branch name to clipboard