Removed man options that were conflicting with MacOSX

Hello,

On MacOSX man there is no --nj option available for man. It was breaking pcmpl-args. I can't find what --nj means, even on linux "man man" page: http://linux.about.com/od/commands/l/blcmdl1_man.htm . When I did this change it is working on my machine.

Thanks,
Robert