Update description of update_vendor command.
Update description of update_vendor command.

Weasyl/misaka,hepochen/misaka,hepochen/hoedown_misaka,hepochen/hoedown_misaka,hepochen/misaka,Weasyl/misaka,FSX/misaka,hepochen/hoedown_misaka,Weasyl/misaka,hepochen/misaka,FSX/misaka,lepture/misaka,FSX/misaka,lepture/misaka,Weasyl/misaka,lepture/misaka,Weasyl/misaka,FSX/misaka