manual: Update runc-events.8.md with source
manual: Update runc-events.8.md with source

--events argument's usage was updated by:
commit:a62dbf48b0fe5e2e28e3cc9dc80a70d2ec5ebc25
We need to update manual together.

This patch also removes last useless blank line
in manual.

Signed-off-by: Zhao Lei <aacdd228f50c574b28b524b23f12fb9d52d6e0e3@cn.fujitsu.com>

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