README.md: clarify OCI JSON files
README.md: clarify OCI JSON files

Signed-off-by: Qiang Huang <488e06933c295c76472a67dbc6657ac40a756953@huawei.com>

abduld/runc,crosbymichael/runc,opencontainers/runc,docker/runc,abduld/runc,estesp/runc,shishir-a412ed/runc,avagin/runc,coolljt0725/runc,nkwilson/runc,hqhq/runc,nkwilson/runc,wking/runc,inatatsu/runc,crosbymichael/runc,cloudfoundry-incubator/runc,stefanberger/runc,mikebrow/runc,laijs/runc,wking/runc,sunyuan3/runc,wangkirin/runc,rhatdan/runc,justincormack/runc,justincormack/runc,keloyang/runc,fabiokung/runc,avagin/runc,kimh/runc,xiaochenshen/runc,ZJU-SEL/runc,kimh/runc,wking/runc,dqminh/runc,mheon/runc,runcom/runc,albertoleal/runc,justincormack/runc,cyphar/runc,jhowardmsft/runc,keloyang/runc,kolyshkin/runc,stefanberger/runc,opencontainers/runc,kimh/runc,albertoleal/runc,sunyuan3/runc,rajasec/runc,dqminh/runc,xiaochenshen/runc,sunyuan3/runc,maxamillion/runc,opencontainers/runc,vbatts/runc,ZJU-SEL/runc,mYmNeo/runc,mikebrow/runc,hqhq/runc,mYmNeo/runc,runcom/runc,nkwilson/runc,jhowardmsft/runc,jhowardmsft/runc,rhatdan/runc,kolyshkin/runc,xiaochenshen/runc,coolljt0725/runc,shishir-a412ed/runc,mikebrow/runc,runcom/runc,keloyang/runc,vbatts/runc,rajasec/runc,docker/runc,maxamillion/runc,mheon/runc,adrianreber/runc,inatatsu/runc,dqminh/runc,fabiokung/runc,adrianreber/runc,laijs/runc,hqhq/runc,opencontainers/runc,cloudfoundry-incubator/runc,estesp/runc,cyphar/runc,kolyshkin/runc,mYmNeo/runc,shishir-a412ed/runc,wangkirin/runc,rajasec/runc,docker/runc,stefanberger/runc,ZJU-SEL/runc,WeiZhang555/runc,WeiZhang555/runc,coolljt0725/runc,maxamillion/runc,inatatsu/runc,adrianreber/runc,laijs/runc,rhatdan/runc,rhatdan/runc,kolyshkin/runc,WeiZhang555/runc,cloudfoundry-incubator/runc,cyphar/runc,avagin/runc,wangkirin/runc,mheon/runc,albertoleal/runc,dqminh/runc,fabiokung/runc,abduld/runc,estesp/runc,vbatts/runc,crosbymichael/runc