Clarify LabelInfo documentation
Clarify LabelInfo documentation

Clearly split up the fields set by LABELS vs. DETAILED_LABELS, and
provide a one-sentence summary of each option. Provide more precise
definitions for approved/rejected/recommended/disliked, and indicate
that they only list one user per label. (Precisely which user is hard
to define, since it comes out of the submit rule evaluator.)

Change-Id: Ia3d5f5806766abdc15d6711ba6a6adcc30040ace

midnightradio/gerrit,qtproject/qtqa-gerrit,jackminicloud/test,Distrotech/gerrit,midnightradio/gerrit,gcoders/gerrit,anminhsu/gerrit,MerritCR/merrit,quyixia/gerrit,quyixia/gerrit,MerritCR/merrit,bootstraponline-archive/gerrit-mirror,WANdisco/gerrit,Team-OctOS/host_gerrit,TonyChai24/test,Overruler/gerrit,thinkernel/gerrit,Overruler/gerrit,netroby/gerrit,WANdisco/gerrit,MerritCR/merrit,Distrotech/gerrit,bootstraponline-archive/gerrit-mirror,renchaorevee/gerrit,bootstraponline-archive/gerrit-mirror,gerrit-review/gerrit,dwhipstock/gerrit,jackminicloud/test,quyixia/gerrit,Saulis/gerrit,gracefullife/gerrit,thesamet/gerrit,Saulis/gerrit,supriyantomaftuh/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,gcoders/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,netroby/gerrit,supriyantomaftuh/gerrit,supriyantomaftuh/gerrit,thinkernel/gerrit,WANdisco/gerrit,midnightradio/gerrit,joshuawilson/merrit,Saulis/gerrit,Overruler/gerrit,Distrotech/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,Distrotech/gerrit,hdost/gerrit,TonyChai24/test,gcoders/gerrit,netroby/gerrit,netroby/gerrit,MerritCR/merrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,netroby/gerrit,gcoders/gerrit,thinkernel/gerrit,bpollack/gerrit,GerritCodeReview/gerrit,gerrit-review/gerrit,supriyantomaftuh/gerrit,renchaorevee/gerrit,thesamet/gerrit,hdost/gerrit,anminhsu/gerrit,bootstraponline-archive/gerrit-mirror,Team-OctOS/host_gerrit,Team-OctOS/host_gerrit,thinkernel/gerrit,dwhipstock/gerrit,hdost/gerrit,gcoders/gerrit,qtproject/qtqa-gerrit,Team-OctOS/host_gerrit,MerritCR/merrit,Distrotech/gerrit,thesamet/gerrit,gracefullife/gerrit,Seinlin/gerrit,bpollack/gerrit,pkdevbox/gerrit,thinkernel/gerrit,midnightradio/gerrit,Overruler/gerrit,thesamet/gerrit,Seinlin/gerrit,Distrotech/gerrit,renchaorevee/gerrit,quyixia/gerrit,anminhsu/gerrit,WANdisco/gerrit,pkdevbox/gerrit,renchaorevee/gerrit,thesamet/gerrit,quyixia/gerrit,Team-OctOS/host_gerrit,joshuawilson/merrit,bootstraponline-archive/gerrit-mirror,bpollack/gerrit,TonyChai24/test,gerrit-review/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,bpollack/gerrit,renchaorevee/gerrit,TonyChai24/test,qtproject/qtqa-gerrit,midnightradio/gerrit,netroby/gerrit,supriyantomaftuh/gerrit,thesamet/gerrit,bpollack/gerrit,gracefullife/gerrit,anminhsu/gerrit,hdost/gerrit,jackminicloud/test,gerrit-review/gerrit,hdost/gerrit,Overruler/gerrit,renchaorevee/gerrit,GerritCodeReview/gerrit,pkdevbox/gerrit,jackminicloud/test,joshuawilson/merrit,MerritCR/merrit,thinkernel/gerrit,Saulis/gerrit,Team-OctOS/host_gerrit,renchaorevee/gerrit,Seinlin/gerrit,supriyantomaftuh/gerrit,pkdevbox/gerrit,GerritCodeReview/gerrit,Overruler/gerrit,gcoders/gerrit,pkdevbox/gerrit,anminhsu/gerrit,midnightradio/gerrit,anminhsu/gerrit,Distrotech/gerrit,quyixia/gerrit,dwhipstock/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,hdost/gerrit,jackminicloud/test,TonyChai24/test,Seinlin/gerrit,jackminicloud/test,dwhipstock/gerrit,gcoders/gerrit,MerritCR/merrit,gerrit-review/gerrit,supriyantomaftuh/gerrit,dwhipstock/gerrit,WANdisco/gerrit,bootstraponline-archive/gerrit-mirror,anminhsu/gerrit,joshuawilson/merrit,pkdevbox/gerrit,WANdisco/gerrit,dwhipstock/gerrit,thesamet/gerrit,netroby/gerrit,Seinlin/gerrit,gracefullife/gerrit,Team-OctOS/host_gerrit,TonyChai24/test,Saulis/gerrit,jackminicloud/test,quyixia/gerrit,gerrit-review/gerrit,joshuawilson/merrit,gracefullife/gerrit,dwhipstock/gerrit,GerritCodeReview/gerrit,TonyChai24/test,thinkernel/gerrit,Seinlin/gerrit,hdost/gerrit,gerrit-review/gerrit,bpollack/gerrit,Seinlin/gerrit,joshuawilson/merrit,pkdevbox/gerrit,Saulis/gerrit