Fix bad link format in the guide
Fix bad link format in the guide

dangjun625/cowboy,turtleDeng/cowboy,callsign-core/cowboy_hybi00,bsmr-erlang/cowboy,acrispin/cowboy,rabbitmq/cowboy,CrankWheel/cowboy,K2InformaticsGmbH/cowboy,callsign-core/cowboy_hybi00,sile/cowboy,nviennot/cowboy,omusico/cowboy,yangchengjian/cowboy,noname007/cowboy,cad627/cowboy,cad627/cowboy,odo/cowboy,kivra/cowboy,yangchengjian/cowboy,binarin/cowboy,paulperegud/cowboy,grahamrhay/cowboy,binarin/cowboy,Reimerei/cowboy,pap/cowboy,hairyhum/cowboy,imdeps/cowboy,bobos/ecweb,276361270/cowboy,ninenines/cowboy