add call-seq docs for AuthChallenge#initialize
add call-seq docs for AuthChallenge#initialize

eligoenergy/mechanize,uksa/mechanize,gchan/mechanize,uksa/mechanize,flavorjones/mechanize,jeremiahmarks/mechanize,bugmelody/mechanize,jeremiahmarks/mechanize,pwnall/mechanize,sparklemotion/mechanize,pwnall/mechanize,sjchakrav/mechanize,eligoenergy/mechanize,sparklemotion/mechanize,gchan/mechanize,bugmelody/mechanize,sjchakrav/mechanize