Reorganize/improve comparison doc a bit.
Reorganize/improve comparison doc a bit.

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