point to the correct documentation link
point to the correct documentation link

fix #967

prezi/gunicorn,MrKiven/gunicorn,ccl0326/gunicorn,mvaled/gunicorn,elelianghh/gunicorn,zhoucen/gunicorn,prezi/gunicorn,gtrdotmcs/gunicorn,keakon/gunicorn,malept/gunicorn,gtrdotmcs/gunicorn,z-fork/gunicorn,prezi/gunicorn,WSDC-NITWarangal/gunicorn,zhoucen/gunicorn,zhoucen/gunicorn,gtrdotmcs/gunicorn,harrisonfeng/gunicorn,tejasmanohar/gunicorn,ccl0326/gunicorn,malept/gunicorn,ccl0326/gunicorn,ephes/gunicorn,mvaled/gunicorn,mvaled/gunicorn,tempbottle/gunicorn,GitHublong/gunicorn,malept/gunicorn