Update docs for `Size` and `RefCount` for `UsageData`
Update docs for `Size` and `RefCount` for `UsageData`

In 27294, `Size` and `RefCount` has been wrapped into `UsageData`
and is only exposed in `GET system/df`. Though the docs was not
updated in `docker_remote_api_v1.25.md`.

This fix updates the docs to refect the changes for `UsageData`.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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