Update versioning instructions.
Update versioning instructions.

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