Fix documentation for metrics-log4j2
Fix documentation for metrics-log4j2

mtakaki/metrics,mspiegel/metrics,timezra/metrics,mnuessler/metrics,gburton1/metrics,jasw/metrics,unitsofmeasurement/metrics,kevintvh/metrics,bentatham/metrics,wfxiang08/metrics,randomstatistic/metrics,slovdahl/metrics,valery1707/dropwizard-metrics,ohr/metrics,cirrus-dev/metrics,tempredirect/metrics,mt0803/metrics,gburton1/metrics,egymgmbh/metrics,mattnelson/metrics,signalfx/metrics,chenxianghua2014/metrics,ChetnaChaudhari/metrics,ind9/metrics,AltitudeDigital/metrics,rexren/metrics,jplock/metrics