Add two new third-party exporters to the list.
Add two new third-party exporters to the list.

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