clarify update-delay and rolling update behavior
clarify update-delay and rolling update behavior

Signed-off-by: Charles Smith <dd8094a0ebe127b002d25a204df37082ff5d8b3b@docker.com>

dsheets/moby,xuxinkun/docker,diogomonica/docker,afein/docker,ndeloof/docker,jwhonce/docker,tklauser/docker,michael-holzheu/docker,x1022as/docker,miminar/docker,ibuildthecloud/docker,mstanleyjones/docker,hypriot/docker,haveatry/docker,trebonian/docker,estesp/docker,duglin/docker,nawawi/docker,q384566678/docker,lixiaobing1/docker,catinthesky/docker,HideoYamauchi/docker,bearstech/moby,mtesselH/docker,whuwxl/docker,ibuildthecloud/docker,tophj-ibm/docker,twaugh/docker,xuxinkun/docker,stevvooe/docker,yummypeng/docker,dccurtis/docker,hqhq/moby,msabansal/docker,charleszheng44/moby,jthelin/docker,erikstmartin/docker,Mokolea/docker,eskaaren/docker,qudongfang/docker,johnstep/moby-moby,jvanz/docker,darrenstahlmsft/docker,duglin/docker,darrenstahlmsft/moby,ColinHebert/docker,darrenstahlmsft/docker,icaoweiwei/docker,trebonian/docker,rremer/moby,cyphar/docker,naveed-jamil-tenpearls/moby,ffoysal/docker,tmp6154/docker,madhanrm/docker,trebonian/docker,Ramzec/docker,pradipd/moby,johnstep/moby-moby,mike1729/docker,JMesser81/docker,harche/docker,nawawi/docker,13W/docker,Ramzec/docker,kolyshkin/moby,jimjag/docker,afein/docker,gjaskiewicz/moby,raja-sami-10p/moby,moby/moby,docker/docker,liaoqingwei/docker,mtrmac/docker,duglin/docker,Syntaxide/docker,moypray/docker,dsheets/moby,jwhonce/docker,splunk/docker,Ramzec/docker,cyphar/docker,konstruktoid/docker-upstream,akira-baruah/docker,laijs/docker,laijs/moby,icaoweiwei/docker,ndeloof/docker,michelvocks/docker,miminar/docker,dims/docker,thtanaka/docker,trebonian/docker,ColinHebert/docker,kojiromike/docker,lixiaobing1/docker,bearstech/moby,dongjoon-hyun/docker,jvanz/docker,KarthikNayak/docker,flavio/docker,SvenDowideit/docker,jthelin/docker,prertik/docker,dims/docker,yummypeng/docker,yosifkit/docker,allencloud/docker,jwhonce/docker,shhsu/docker,bearstech/moby,bearstech/moby,kencochrane/docker,POLJM242/docker,moul/docker,kolyshkin/docker,crosbymichael/docker,endophage/docker,dmcgowan/docker,nawawi/docker,resin-io/docker,vdemeester/docker,lixiaobing10051267/docker,moby/moby,sfsmithcha/docker,cloudflare/docker,mikebrow/docker,yasiramin10p/moby,moul/docker,tophj-ibm/moby,bonczj/moby-json-file-logger,tmp6154/docker,diogomonica/docker,crosbymichael/docker,AkihiroSuda/docker,flavio/docker,shishir-a412ed/docker,sterchelen/docker,hqhq/moby,mohmost12/docker,naveed-jamil-tenpearls/moby,AkihiroSuda/docker,kencochrane/docker,tonistiigi/docker,mstanleyjones/docker,dgageot/docker,gnailuy/docker,nalind/docker,jimjag/docker,sarnautov/moby,rhatdan/docker,michael-holzheu/docker,SvenDowideit/docker,unclejack/docker,icaoweiwei/docker,PatrickLang/moby,allencloud/docker,amatsus/docker,ajaymdesai/docker,tagomoris/docker,jvanz/docker,mtesselH/docker,madhanrm/docker,Ramzec/docker,rhatdan/docker,estesp/docker,kolyshkin/docker,mstanleyjones/docker,noironetworks/docker,yosifkit/docker,noironetworks/docker,michelvocks/docker,KingEmet/docker,endophage/docker,kunalkushwaha/docker,mtrmac/docker,pramodhkp/moby,srust/docker,xiekeyang/docker,imkin/moby,konstruktoid/docker-upstream,kolyshkin/moby,whuwxl/docker,laijs/moby,diogomonica/docker,mkumatag/docker,ibuildthecloud/docker,sdurrheimer/docker,rancher/docker,coreos/docker,coreos/docker,flavio/docker,imkin/moby,msabansal/docker,mtanlee/docker,konstruktoid/docker-upstream,mixja/docker,djs55/docker,alfred-landrum/docker,x1022as/docker,hypriot/docker,YuPengZTE/docker,mike1729/docker,sarnautov/moby,x1022as/docker,moypray/docker,portworx/docker,tagomoris/docker,YuPengZTE/docker,resin-io/docker,KarthikNayak/docker,gschaetz/moby,afein/docker,tklauser/docker,nawawi/docker,PatrickLang/moby,rremer/moby,thaJeztah/docker,xuxinkun/docker,POLJM242/docker,dperny/docker,maxamillion/docker,dccurtis/docker,michael-holzheu/docker,cloudflare/docker,Mokolea/docker,Mokolea/docker,moul/docker,charleszheng44/moby,moypray/docker,prertik/docker,pramodhkp/moby,mike1729/docker,msabansal/docker,portworx/docker,sarnautov/moby,justincormack/docker,ripcurld0/moby,ripcurld0/moby,HuKeping/docker,haveatry/docker,liaoqingwei/docker,mixja/docker,scotttlin/docker,kencochrane/docker,coolljt0725/docker,sdurrheimer/docker,tianon/docker,raja-sami-10p/moby,danyalKhaliq10p/moby,miminar/docker,cyphar/docker,vdemeester/docker,tonistiigi/docker,yasiramin10p/moby,coolljt0725/docker,ibuildthecloud/docker,mtesselH/docker,nalind/docker,darrenstahlmsft/moby,johnstep/moby-moby,tagomoris/docker,mtrmac/docker,hypriot/docker,JMesser81/docker,jimjag/docker,ibuildthecloud/docker,laijs/docker,catinthesky/docker,shhsu/docker,danyalKhaliq10p/moby,yp-engineering/docker,dperny/docker,alfred-landrum/docker,tophj-ibm/docker,pradipd/moby,estesp/docker,dmcgowan/docker,imkin/moby,erikh/docker,moby/moby,erikh/docker,asbjornenge/docker,KingEmet/docker,PatrickLang/moby,jlhawn/docker,jameszhan/docker,tophj-ibm/moby,docker/docker,haveatry/docker,mahak/docker,whuwxl/docker,gnailuy/docker,michelvocks/docker,catinthesky/docker,erikstmartin/docker,moul/docker,JMesser81/docker,yongtang/docker,cpuguy83/docker,dims/docker,HideoYamauchi/docker,sfsmithcha/docker,Syntaxide/docker,tophj-ibm/docker,coolljt0725/docker,tianon/docker,scotttlin/docker,mikedougherty/docker,yongtang/docker,lixiaobing10051267/docker,brahmaroutu/docker,konstruktoid/docker-1,rhatdan/docker,konstruktoid/docker-1,maxamillion/docker,naveed-jamil-tenpearls/moby,unclejack/docker,mikedougherty/docker,kunalkushwaha/docker,gschaetz/moby,tophj-ibm/moby,sdurrheimer/docker,abhinavdahiya/docker,shishir-a412ed/docker,twaugh/docker,xiaods/docker,paralin/docker,dgageot/docker,rancher/docker,liaoqingwei/docker,mikedougherty/docker,crosbymichael/docker,xiaods/docker,jlhawn/docker,qudongfang/docker,ffoysal/docker,laijs/moby,thtanaka/docker,fcrisciani/docker,AkihiroSuda/docker,jimjag/docker,yummypeng/docker,laijs/docker,amatsus/docker,sfsmithcha/docker,jameszhan/docker,bonczj/moby-json-file-logger,mkumatag/docker,eskaaren/docker,kojiromike/docker,SvenDowideit/docker,darrenstahlmsft/docker,paralin/docker,moby/moby,amatsus/docker,erikstmartin/docker,tmp6154/docker,raja-sami-10p/moby,darrenstahlmsft/moby,portworx/docker,HuKeping/docker,nalind/docker,mohmost12/docker,twaugh/docker,akira-baruah/docker,dongjoon-hyun/docker,shhsu/docker,vdemeester/docker,mikebrow/docker,rancher/docker,dperny/docker,pramodhkp/moby,konstruktoid/docker-1,yosifkit/docker,thaJeztah/docker,eskaaren/docker,srust/docker,HuKeping/docker,maxamillion/docker,resin-io/docker,sterchelen/docker,prertik/docker,q384566678/docker,allencloud/docker,paralin/docker,splunk/docker,mixja/docker,alfred-landrum/docker,kunalkushwaha/docker,docker/docker,cpuguy83/docker,xiekeyang/docker,harche/docker,pradipd/moby,stevvooe/docker,yp-engineering/docker,endophage/docker,asbjornenge/docker,jlhawn/docker,gjaskiewicz/moby,ColinHebert/docker,dgageot/docker,lixiaobing1/docker,justincormack/docker,yp-engineering/docker,mahak/docker,AkihiroSuda/docker,kojiromike/docker,abhinavdahiya/docker,13W/docker,scotttlin/docker,erikh/docker,splunk/docker,harche/docker,ajaymdesai/docker,nalind/docker,konstruktoid/docker-upstream,asbjornenge/docker,qudongfang/docker,Syntaxide/docker,srust/docker,unclejack/docker,thaJeztah/docker,ajaymdesai/docker,dsheets/moby,mahak/docker,coreos/docker,13W/docker,madhanrm/docker,brahmaroutu/docker,Mokolea/docker,mkumatag/docker,tonistiigi/docker,kolyshkin/moby,YuPengZTE/docker,ripcurld0/moby,gschaetz/moby,gnailuy/docker,hqhq/moby,yasiramin10p/moby,brahmaroutu/docker,cpuguy83/docker,dongjoon-hyun/docker,shishir-a412ed/docker,xiekeyang/docker,13W/docker,danyalKhaliq10p/moby,13W/docker,gjaskiewicz/moby,rremer/moby,ffoysal/docker,cpuguy83/docker,yosifkit/docker,justincormack/docker,flavio/docker,lixiaobing10051267/docker,thtanaka/docker,thaJeztah/docker,ndeloof/docker,q384566678/docker,djs55/docker,paralin/docker,xiaods/docker,gnailuy/docker,mikebrow/docker,charleszheng44/moby,jhorwit2/docker,mtanlee/docker,djs55/docker,fcrisciani/docker,KarthikNayak/docker,jhorwit2/docker,noironetworks/docker,cloudflare/docker,abhinavdahiya/docker,stevvooe/docker,dmcgowan/docker,mahak/docker,bonczj/moby-json-file-logger,jameszhan/docker,HideoYamauchi/docker,yongtang/docker,fcrisciani/docker,tklauser/docker,sterchelen/docker,dccurtis/docker,mohmost12/docker,mtanlee/docker,jhorwit2/docker,KingEmet/docker