Update docs a bit.
Update docs a bit.

signalfx/metrics,dropwizard/metrics,valery1707/dropwizard-metrics,slachiewicz/metrics,jasw/metrics,gorzell/metrics,mnuessler/metrics,box/metrics,fcrepo4-archive/metrics,jplock/metrics,cirrus-dev/metrics,rexren/metrics,mattnelson/metrics,infusionsoft/yammer-metrics,fcrepo4-archive/metrics,erikvanoosten/metrics-scala,mspiegel/metrics,dropwizard/metrics,mveitas/metrics,infusionsoft/yammer-metrics,tempredirect/metrics,slovdahl/metrics,gorzell/metrics,AltitudeDigital/metrics,wickedshimmy/metrics-scala,egymgmbh/metrics,ind9/metrics,Banno/metrics,mt0803/metrics,mtakaki/metrics,wfxiang08/metrics,chenxianghua2014/metrics,ohr/metrics,mveitas/metrics,thelastpickle/metrics,ChetnaChaudhari/metrics,timezra/metrics,box/metrics,bentatham/metrics,gburton1/metrics,gburton1/metrics,randomstatistic/metrics,kevintvh/metrics,gorzell/metrics,scullxbones/metrics-scala,dropwizard/metrics,maciej/metrics-scala,unitsofmeasurement/metrics