update local test instructions (#452)
update local test instructions (#452)

fixes #446
jasminejaksic/istio.github.io,smawson/istio.github.io,istio/istio.io,ZackButcher/istio.github.io,istio/istio.io,ZackButcher/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,smawson/istio.github.io,geeknoid/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,istio/istio.io,jasminejaksic/istio.github.io,ZackButcher/istio.github.io,jasminejaksic/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,ZackButcher/istio.github.io,jasminejaksic/istio.github.io,smawson/istio.github.io,istio/istio.io,istio/istio.io,smawson/istio.github.io,linsun/istio.github.io,geeknoid/istio.github.io