update intro to say there are four things to consider
update intro to say there are four things to consider

Signed-off-by: Michael Friis <b277f9487d75716d7403118b38ef7d4e24b310da@gmail.com>

catinthesky/docker,dims/docker,Syntaxide/docker,laijs/moby,paralin/docker,gnailuy/docker,mahak/docker,tophj-ibm/docker,maxamillion/docker,prertik/docker,erikh/docker,dims/docker,coreos/docker,unclejack/docker,maxamillion/docker,afein/docker,Mokolea/docker,jimjag/docker,gschaetz/moby,mikedougherty/docker,cpuguy83/docker,lixiaobing1/docker,dperny/docker,konstruktoid/docker-upstream,thaJeztah/docker,justincormack/docker,ffoysal/docker,jwhonce/docker,michael-holzheu/docker,mohmost12/docker,harche/docker,AkihiroSuda/docker,kencochrane/docker,portworx/docker,paralin/docker,vdemeester/docker,kojiromike/docker,mstanleyjones/docker,tmp6154/docker,xiekeyang/docker,mtesselH/docker,tmp6154/docker,AkihiroSuda/docker,djs55/docker,asbjornenge/docker,moypray/docker,miminar/docker,KingEmet/docker,moypray/docker,sfsmithcha/docker,charleszheng44/moby,nawawi/docker,portworx/docker,POLJM242/docker,gschaetz/moby,naveed-jamil-tenpearls/moby,alfred-landrum/docker,danyalKhaliq10p/moby,haveatry/docker,alfred-landrum/docker,kunalkushwaha/docker,mstanleyjones/docker,harche/docker,mixja/docker,YuPengZTE/docker,KarthikNayak/docker,HuKeping/docker,cyphar/docker,unclejack/docker,fcrisciani/docker,jimjag/docker,asbjornenge/docker,duglin/docker,pradipd/moby,mike1729/docker,raja-sami-10p/moby,sterchelen/docker,sterchelen/docker,estesp/docker,mikedougherty/docker,xiekeyang/docker,JMesser81/docker,mike1729/docker,ibuildthecloud/docker,ibuildthecloud/docker,harche/docker,erikh/docker,rancher/docker,jwhonce/docker,konstruktoid/docker-1,mike1729/docker,Ramzec/docker,gjaskiewicz/moby,akira-baruah/docker,madhanrm/docker,justincormack/docker,Syntaxide/docker,HideoYamauchi/docker,darrenstahlmsft/moby,mtrmac/docker,konstruktoid/docker-upstream,cpuguy83/docker,nawawi/docker,tophj-ibm/moby,qudongfang/docker,bonczj/moby-json-file-logger,gnailuy/docker,dsheets/moby,pradipd/moby,johnstep/moby-moby,johnstep/moby-moby,splunk/docker,KarthikNayak/docker,amatsus/docker,naveed-jamil-tenpearls/moby,jlhawn/docker,tagomoris/docker,ajaymdesai/docker,HideoYamauchi/docker,pramodhkp/moby,tmp6154/docker,sterchelen/docker,xiekeyang/docker,jameszhan/docker,coreos/docker,rhatdan/docker,bearstech/moby,tagomoris/docker,laijs/moby,portworx/docker,msabansal/docker,dperny/docker,imkin/moby,mixja/docker,estesp/docker,yummypeng/docker,fcrisciani/docker,q384566678/docker,amatsus/docker,bearstech/moby,djs55/docker,xiaods/docker,mtanlee/docker,srust/docker,moul/docker,kolyshkin/moby,cyphar/docker,kunalkushwaha/docker,laijs/docker,YuPengZTE/docker,tagomoris/docker,rremer/moby,konstruktoid/docker-1,resin-io/docker,tklauser/docker,catinthesky/docker,mkumatag/docker,tophj-ibm/docker,erikstmartin/docker,kolyshkin/docker,whuwxl/docker,Ramzec/docker,konstruktoid/docker-upstream,allencloud/docker,trebonian/docker,trebonian/docker,PatrickLang/moby,cloudflare/docker,bonczj/moby-json-file-logger,kolyshkin/moby,msabansal/docker,thaJeztah/docker,ColinHebert/docker,nawawi/docker,shishir-a412ed/docker,yummypeng/docker,endophage/docker,cyphar/docker,thtanaka/docker,haveatry/docker,jameszhan/docker,mohmost12/docker,thaJeztah/docker,eskaaren/docker,bonczj/moby-json-file-logger,thtanaka/docker,rremer/moby,SvenDowideit/docker,sarnautov/moby,cloudflare/docker,erikh/docker,tophj-ibm/moby,nalind/docker,crosbymichael/docker,johnstep/moby-moby,mahak/docker,michelvocks/docker,liaoqingwei/docker,lixiaobing10051267/docker,naveed-jamil-tenpearls/moby,AkihiroSuda/docker,tianon/docker,tklauser/docker,qudongfang/docker,danyalKhaliq10p/moby,tophj-ibm/docker,dccurtis/docker,asbjornenge/docker,raja-sami-10p/moby,tonistiigi/docker,jimjag/docker,sdurrheimer/docker,mixja/docker,gschaetz/moby,noironetworks/docker,kojiromike/docker,moby/moby,moypray/docker,diogomonica/docker,afein/docker,icaoweiwei/docker,ripcurld0/moby,scotttlin/docker,haveatry/docker,darrenstahlmsft/docker,KarthikNayak/docker,dccurtis/docker,paralin/docker,flavio/docker,ndeloof/docker,rhatdan/docker,sfsmithcha/docker,moby/moby,HuKeping/docker,madhanrm/docker,SvenDowideit/docker,crosbymichael/docker,flavio/docker,trebonian/docker,rancher/docker,liaoqingwei/docker,yongtang/docker,dgageot/docker,ColinHebert/docker,JMesser81/docker,docker/docker,michael-holzheu/docker,endophage/docker,erikstmartin/docker,coreos/docker,rancher/docker,Ramzec/docker,scotttlin/docker,shhsu/docker,tianon/docker,fcrisciani/docker,thaJeztah/docker,pramodhkp/moby,cloudflare/docker,srust/docker,vdemeester/docker,charleszheng44/moby,nawawi/docker,mikebrow/docker,mkumatag/docker,coolljt0725/docker,shishir-a412ed/docker,justincormack/docker,x1022as/docker,srust/docker,ibuildthecloud/docker,moul/docker,kojiromike/docker,lixiaobing1/docker,moby/moby,jameszhan/docker,michelvocks/docker,lixiaobing10051267/docker,scotttlin/docker,rhatdan/docker,ndeloof/docker,AkihiroSuda/docker,diogomonica/docker,michelvocks/docker,Mokolea/docker,dsheets/moby,icaoweiwei/docker,sfsmithcha/docker,coolljt0725/docker,gnailuy/docker,JMesser81/docker,x1022as/docker,dgageot/docker,xuxinkun/docker,dperny/docker,djs55/docker,flavio/docker,resin-io/docker,ffoysal/docker,PatrickLang/moby,afein/docker,dims/docker,kencochrane/docker,mahak/docker,mtesselH/docker,konstruktoid/docker-1,estesp/docker,jthelin/docker,paralin/docker,mikebrow/docker,erikstmartin/docker,q384566678/docker,eskaaren/docker,nalind/docker,yosifkit/docker,tonistiigi/docker,shishir-a412ed/docker,dmcgowan/docker,yummypeng/docker,PatrickLang/moby,mahak/docker,rremer/moby,jlhawn/docker,xuxinkun/docker,yosifkit/docker,darrenstahlmsft/moby,charleszheng44/moby,imkin/moby,KingEmet/docker,ajaymdesai/docker,ripcurld0/moby,SvenDowideit/docker,whuwxl/docker,ffoysal/docker,tophj-ibm/moby,resin-io/docker,ajaymdesai/docker,YuPengZTE/docker,thtanaka/docker,jwhonce/docker,jvanz/docker,whuwxl/docker,icaoweiwei/docker,stevvooe/docker,jlhawn/docker,mtanlee/docker,HuKeping/docker,konstruktoid/docker-upstream,maxamillion/docker,hqhq/moby,noironetworks/docker,HideoYamauchi/docker,hqhq/moby,trebonian/docker,gjaskiewicz/moby,xuxinkun/docker,jthelin/docker,mkumatag/docker,gnailuy/docker,xiaods/docker,yasiramin10p/moby,raja-sami-10p/moby,duglin/docker,sarnautov/moby,mtrmac/docker,Ramzec/docker,kunalkushwaha/docker,moul/docker,alfred-landrum/docker,catinthesky/docker,sarnautov/moby,moby/moby,imkin/moby,jvanz/docker,docker/docker,eskaaren/docker,mstanleyjones/docker,moul/docker,miminar/docker,kencochrane/docker,laijs/moby,akira-baruah/docker,allencloud/docker,x1022as/docker,laijs/docker,diogomonica/docker,pradipd/moby,docker/docker,darrenstahlmsft/docker,kolyshkin/docker,mtrmac/docker,Mokolea/docker,jimjag/docker,liaoqingwei/docker,yongtang/docker,mikebrow/docker,bearstech/moby,flavio/docker,unclejack/docker,michael-holzheu/docker,dgageot/docker,yasiramin10p/moby,prertik/docker,dccurtis/docker,crosbymichael/docker,shhsu/docker,ibuildthecloud/docker,hqhq/moby,splunk/docker,nalind/docker,bearstech/moby,noironetworks/docker,Mokolea/docker,pramodhkp/moby,cpuguy83/docker,allencloud/docker,lixiaobing1/docker,tklauser/docker,yosifkit/docker,stevvooe/docker,ndeloof/docker,sdurrheimer/docker,dsheets/moby,yosifkit/docker,dmcgowan/docker,q384566678/docker,darrenstahlmsft/docker,nalind/docker,endophage/docker,tonistiigi/docker,vdemeester/docker,kolyshkin/moby,mikedougherty/docker,qudongfang/docker,laijs/docker,miminar/docker,sdurrheimer/docker,msabansal/docker,stevvooe/docker,ColinHebert/docker,yasiramin10p/moby,amatsus/docker,yongtang/docker,coolljt0725/docker,gjaskiewicz/moby,jvanz/docker,ibuildthecloud/docker,dmcgowan/docker,shhsu/docker,POLJM242/docker,Syntaxide/docker,cpuguy83/docker,splunk/docker,KingEmet/docker,lixiaobing10051267/docker,mohmost12/docker,xiaods/docker,prertik/docker,darrenstahlmsft/moby,mtanlee/docker,danyalKhaliq10p/moby,duglin/docker,ripcurld0/moby,mtesselH/docker,madhanrm/docker