Document how to enable logging
Document how to enable logging

Not everyone might have experience with glog's default settings, this
change intends to make the start for new users easier.

prometheus/node_exporter,chosenken/node_exporter,bs-github/node_exporter,knweiss/node_exporter,federicobaldo/node_exporter,ema/node_exporter,70-10/node_exporter,AlphaB/node_exporter,bs-github/node_exporter,derekmarcotte/node_exporter,kirussel/node_exporter,mslocrian/flexswitch_exporter,knweiss/node_exporter,derekmarcotte/node_exporter,knweiss/node_exporter,ema/node_exporter,wrouesnel/node_exporter,cbstewart9393/node_exporter,chosenken/node_exporter,Jean-Daniel/node_exporter,aletessier/node_exporter,joehandzik/node_exporter,matthiasr/node_exporter,Jean-Daniel/node_exporter,derekmarcotte/node_exporter,70-10/node_exporter,knweiss/node_exporter,chosenken/node_exporter,ema/node_exporter,robbiet480/node_exporter,cherti/node_exporter,cherti/node_exporter,kirussel/node_exporter,siavashs/node_exporter,asbjornenge/node_exporter,siavashs/node_exporter,trayio/node_exporter,trayio/node_exporter,Jean-Daniel/node_exporter,aletessier/node_exporter,chosenken/node_exporter,siavashs/node_exporter,joehandzik/node_exporter,Jean-Daniel/node_exporter,joehandzik/node_exporter,mslocrian/flexswitch_exporter,wrouesnel/node_exporter,joehandzik/node_exporter,unixboy/node_exporter,prometheus/node_exporter,fefelovgroup/node_exporter,cbstewart9393/node_exporter,derekmarcotte/node_exporter,asbjornenge/node_exporter,siavashs/node_exporter,AlphaB/node_exporter,robbiet480/node_exporter,bs-github/node_exporter,federicobaldo/node_exporter,eripa/node_exporter,eripa/node_exporter,ema/node_exporter,prometheus/node_exporter,fefelovgroup/node_exporter,bs-github/node_exporter,matthiasr/node_exporter