Update feature-stages.md (#915)
Update feature-stages.md (#915)

Minor edit
linsun/istio.github.io,geeknoid/istio.github.io,istio/istio.io,istio/istio.io,linsun/istio.github.io,jasminejaksic/istio.github.io,geeknoid/istio.github.io,ZackButcher/istio.github.io,istio/istio.io,jasminejaksic/istio.github.io,istio/istio.io,ZackButcher/istio.github.io,ZackButcher/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io,jasminejaksic/istio.github.io,geeknoid/istio.github.io,istio/istio.io,ZackButcher/istio.github.io,linsun/istio.github.io,jasminejaksic/istio.github.io