clarify namespace on this rate limiting page (#621)
clarify namespace on this rate limiting page (#621)

* remove un-needed namespace on this page

as it generates errors when user applies them.

* further tweaks to rate limiting

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