Small doc fix: attrs is a dict of lists.
Small doc fix: attrs is a dict of lists.

msabramo/bleach,grinich/bleach,grinich/bleach,marcdm/bleach,crazyzubr/bleach,shavyg2/bleach,shavyg2/bleach,msabramo/bleach,marcdm/bleach,crazyzubr/bleach