fix yaml syntax error in concepts/securyt (#2018)
fix yaml syntax error in concepts/securyt (#2018)


linsun/istio.github.io,geeknoid/istio.github.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,istio/istio.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io