Fix missing list in example VirtualService (#3196)
Fix missing list in example VirtualService (#3196)

`match` should take a list, but here the `-` was missing.
istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,geeknoid/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,geeknoid/istio.github.io,geeknoid/istio.github.io,istio/istio.io