Fix broken example link for delay endpoint.
Fix broken example link for delay endpoint.

nkhuyu/httpbin,Lukasa/httpbin,bradparks/httpbin__http_echo_service_for_testing_http_requests,postmanlabs/httpbin,SunGuo/httpbin,phouse512/httpbin,marinehero/httpbin,OndrejPontes/httpbin,habibmasuro/httpbin,fangdingjun/httpbin,luosam1123/httpbin,yangruiyou85/httpbin,Lukasa/httpbin,habibmasuro/httpbin,Runscope/httpbin,mojaray2k/httpbin,phouse512/httpbin,Runscope/httpbin,Jaccorot/httpbin,SunGuo/httpbin,pskrz/httpbin,bradparks/httpbin__http_echo_service_for_testing_http_requests,hnq90/httpbin,lioonline/httpbin,krissman/httpbin,shaunstanislaus/httpbin,tatsuhiro-t/httpbin,mozillazg/bustard-httpbin,Stackato-Apps/httpbin,mozillazg/bustard-httpbin,mansilladev/httpbin,pestanko/httpbin,krissman/httpbin,sigmavirus24/httpbin,hnq90/httpbin,admin-zhx/httpbin,sigmavirus24/httpbin,ewdurbin/httpbin,mojaray2k/httpbin,shaunstanislaus/httpbin,logonmy/httpbin,scottydelta/httpbin,ashcoding/httpbin,kennethreitz/httpbin,mansilladev/httpbin,gvangool/httpbin,pskrz/httpbin,scottydelta/httpbin,luhkevin/httpbin,logonmy/httpbin,postmanlabs/httpbin,yemingm/httpbin,fangdingjun/httpbin,ashcoding/httpbin,OndrejPontes/httpbin,yangruiyou85/httpbin,yemingm/httpbin,admin-zhx/httpbin,Stackato-Apps/httpbin,nkhuyu/httpbin,kennethreitz/httpbin,pestanko/httpbin,gvangool/httpbin,paranoiasystem/httpbin,paranoiasystem/httpbin,vscarpenter/httpbin,Jaccorot/httpbin,marinehero/httpbin,vscarpenter/httpbin,ewdurbin/httpbin,luosam1123/httpbin,luhkevin/httpbin,lioonline/httpbin