Update Kubernetes SD docs
Update Kubernetes SD docs

Fixes #202

du2016/prometheus-docs,prometheus/docs,Cepave/openfalcon.io,open-falcon/open-falcon.github.io,du2016/prometheus-docs,chosenken/docs,ddfreyne/prometheus-docs,evanphx/docs,ddfreyne/prometheus-docs,chosenken/docs,vic3lord/docs,vic3lord/docs,chosenken/docs,prometheus/docs,chosenken/docs,pdbogen/docs,tcolgate/docs,vic3lord/docs,pdbogen/docs,ddfreyne/prometheus-docs,prometheus/docs,ddfreyne/prometheus-docs,pdbogen/docs,evanphx/docs,du2016/prometheus-docs,open-falcon/open-falcon.github.io,Cepave/openfalcon.io,Cepave/openfalcon.io,tcolgate/docs,open-falcon/open-falcon.github.io,tcolgate/docs,evanphx/docs