Updated cleanup section for bookinfo. (#1373)
Updated cleanup section for bookinfo. (#1373)

checked with Martin ok to force merge
linsun/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,istio/istio.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io,ZackButcher/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,geeknoid/istio.github.io,ZackButcher/istio.github.io,ZackButcher/istio.github.io,ZackButcher/istio.github.io,geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io