Cleanup documentation of the commit-msg hook
Cleanup documentation of the commit-msg hook

Some rewording to make the documentation more clear.

Change-Id: Ia859dfb83616abbf830b896244e4cfc07413ed8e
Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

1yvT0s/gerrit,ashang/aaron-gerrit,Overruler/gerrit,netroby/gerrit,bootstraponline-archive/gerrit-mirror,dwhipstock/gerrit,MerritCR/merrit,GerritCodeReview/gerrit,quyixia/gerrit,joshuawilson/merrit,thesamet/gerrit,ckamm/gerrit,ckamm/gerrit,TonyChai24/test,Team-OctOS/host_gerrit,GerritCodeReview/gerrit,sudosurootdev/gerrit,evanchueng/gerrit,netroby/gerrit,bootstraponline-archive/gerrit-mirror,CandyShop/gerrit,gracefullife/gerrit,midnightradio/gerrit,renchaorevee/gerrit,zommarin/gerrit,gracefullife/gerrit,gcoders/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,renchaorevee/gerrit,atdt/gerrit,hdost/gerrit,anminhsu/gerrit,supriyantomaftuh/gerrit,makholm/gerrit-ceremony,Distrotech/gerrit,anminhsu/gerrit,dwhipstock/gerrit,m1kah/gerrit-contributions,TonyChai24/test,hdost/gerrit,keerath/gerrit_newssh,joshuawilson/merrit,joshuawilson/merrit,atdt/gerrit,dwhipstock/gerrit,renchaorevee/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,gerrit-review/gerrit,1yvT0s/gerrit,evanchueng/gerrit,TonyChai24/test,jeblair/gerrit,teamblueridge/gerrit,Team-OctOS/host_gerrit,bootstraponline-archive/gerrit-mirror,midnightradio/gerrit,MerritCR/merrit,rtyley/mini-git-server,jackminicloud/test,Overruler/gerrit,joshuawilson/merrit,1yvT0s/gerrit,Saulis/gerrit,jackminicloud/test,WANdisco/gerrit,quyixia/gerrit,joshuawilson/merrit,supriyantomaftuh/gerrit,cjh1/gerrit,basilgor/gerrit,Distrotech/gerrit,bpollack/gerrit,sudosurootdev/gerrit,thesamet/gerrit,renchaorevee/gerrit,netroby/gerrit,quyixia/gerrit,pkdevbox/gerrit,jackminicloud/test,thinkernel/gerrit,WANdisco/gerrit,anminhsu/gerrit,jeblair/gerrit,WANdisco/gerrit,Team-OctOS/host_gerrit,TonyChai24/test,WANdisco/gerrit,bootstraponline-archive/gerrit-mirror,thinkernel/gerrit,atdt/gerrit,ckamm/gerrit,ashang/aaron-gerrit,supriyantomaftuh/gerrit,bpollack/gerrit,skurfuerst/gerrit,qtproject/qtqa-gerrit,midnightradio/gerrit,CandyShop/gerrit,m1kah/gerrit-contributions,skurfuerst/gerrit,ckamm/gerrit,makholm/gerrit-ceremony,jackminicloud/test,teamblueridge/gerrit,m1kah/gerrit-contributions,hdost/gerrit,Saulis/gerrit,Distrotech/gerrit,basilgor/gerrit,duboisf/gerrit,midnightradio/gerrit,bpollack/gerrit,gerrit-review/gerrit,pkdevbox/gerrit,Seinlin/gerrit,hdost/gerrit,hdost/gerrit,Team-OctOS/host_gerrit,bpollack/gerrit,Team-OctOS/host_gerrit,WANdisco/gerrit,MerritCR/merrit,catrope/gerrit,bootstraponline-archive/gerrit-mirror,cjh1/gerrit,basilgor/gerrit,thinkernel/gerrit,austinchic/Gerrit,supriyantomaftuh/gerrit,bpollack/gerrit,thesamet/gerrit,GerritCodeReview/gerrit,duboisf/gerrit,evanchueng/gerrit,bpollack/gerrit,GerritCodeReview/gerrit-attic,1yvT0s/gerrit,Saulis/gerrit,quyixia/gerrit,supriyantomaftuh/gerrit,WANdisco/gerrit,quyixia/gerrit,renchaorevee/gerrit,thinkernel/gerrit,rtyley/mini-git-server,gerrit-review/gerrit,ashang/aaron-gerrit,qtproject/qtqa-gerrit,Seinlin/gerrit,gracefullife/gerrit,netroby/gerrit,pkdevbox/gerrit,hdost/gerrit,joshuawilson/merrit,dwhipstock/gerrit,TonyChai24/test,evanchueng/gerrit,zommarin/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,catrope/gerrit,makholm/gerrit-ceremony,anminhsu/gerrit,Team-OctOS/host_gerrit,sudosurootdev/gerrit,hdost/gerrit,ckamm/gerrit,dwhipstock/gerrit,Distrotech/gerrit,GerritCodeReview/gerrit,duboisf/gerrit,Seinlin/gerrit,catrope/gerrit,atdt/gerrit,basilgor/gerrit,Distrotech/gerrit,MerritCR/merrit,thinkernel/gerrit,Team-OctOS/host_gerrit,teamblueridge/gerrit,cjh1/gerrit,qtproject/qtqa-gerrit,makholm/gerrit-ceremony,TonyChai24/test,anminhsu/gerrit,GerritCodeReview/gerrit-attic,keerath/gerrit_newssh,GerritCodeReview/gerrit,jeblair/gerrit,gracefullife/gerrit,skurfuerst/gerrit,evanchueng/gerrit,gerrit-review/gerrit,quyixia/gerrit,austinchic/Gerrit,sudosurootdev/gerrit,ashang/aaron-gerrit,TonyChai24/test,gerrit-review/gerrit,renchaorevee/gerrit,pkdevbox/gerrit,Saulis/gerrit,Saulis/gerrit,Seinlin/gerrit,cjh1/gerrit,jeblair/gerrit,midnightradio/gerrit,keerath/gerrit_newssh,gerrit-review/gerrit,Overruler/gerrit,MerritCR/merrit,Overruler/gerrit,quyixia/gerrit,gcoders/gerrit,pkdevbox/gerrit,supriyantomaftuh/gerrit,CandyShop/gerrit,thesamet/gerrit,WANdisco/gerrit,netroby/gerrit,thesamet/gerrit,netroby/gerrit,Overruler/gerrit,m1kah/gerrit-contributions,gcoders/gerrit,keerath/gerrit_newssh,MerritCR/merrit,renchaorevee/gerrit,thinkernel/gerrit,atdt/gerrit,zommarin/gerrit,zommarin/gerrit,CandyShop/gerrit,thesamet/gerrit,skurfuerst/gerrit,midnightradio/gerrit,ashang/aaron-gerrit,1yvT0s/gerrit,bootstraponline-archive/gerrit-mirror,qtproject/qtqa-gerrit,keerath/gerrit_newssh,Distrotech/gerrit,sudosurootdev/gerrit,teamblueridge/gerrit,jackminicloud/test,pkdevbox/gerrit,gcoders/gerrit,pkdevbox/gerrit,gcoders/gerrit,zommarin/gerrit,duboisf/gerrit,teamblueridge/gerrit,CandyShop/gerrit,GerritCodeReview/gerrit,jackminicloud/test,supriyantomaftuh/gerrit,anminhsu/gerrit,thesamet/gerrit,Seinlin/gerrit,anminhsu/gerrit,gcoders/gerrit,GerritCodeReview/gerrit-attic,Distrotech/gerrit,dwhipstock/gerrit,Seinlin/gerrit,austinchic/Gerrit,catrope/gerrit,austinchic/Gerrit,Seinlin/gerrit,joshuawilson/merrit,dwhipstock/gerrit,gcoders/gerrit,Saulis/gerrit,MerritCR/merrit,basilgor/gerrit,gerrit-review/gerrit,netroby/gerrit,thinkernel/gerrit,Overruler/gerrit,gracefullife/gerrit,GerritCodeReview/gerrit,jackminicloud/test