Code review comment for ~bryce/ubuntu/+source/nose:fix-lp1859880-py3-sphinx

(For focal, nose was permitted to migrate without fixing the py2 dependence. I think that was probably a 'kicking-the-can-down-the-road' move but what's done is done. This sphinx fix is probably still relevant for improving the package, but the MP would either need to be redone to preserve py2 functionality, or more effort would need taken to remove the remaining py2 dependencies.)