Update Reddit.info docstring for new parameters
Update Reddit.info docstring for new parameters

The docstring previously retained information on the `param_list` parameter,
which has since been split into `fullnames` and `url`.

gschizas/praw,13steinj/praw,leviroth/praw,leviroth/praw,praw-dev/praw,13steinj/praw,gschizas/praw,praw-dev/praw