Improve description of "comment" field in "comment-added" event
Improve description of "comment" field in "comment-added" event

Make it clearer that the comment is the review cover message.

Change-Id: I029a6bd5f1627d5321902eda00e044e4d1f534fd

netroby/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,thinkernel/gerrit,thinkernel/gerrit,hdost/gerrit,Overruler/gerrit,MerritCR/merrit,Overruler/gerrit,anminhsu/gerrit,GerritCodeReview/gerrit,jackminicloud/test,anminhsu/gerrit,Seinlin/gerrit,anminhsu/gerrit,netroby/gerrit,Distrotech/gerrit,quyixia/gerrit,MerritCR/merrit,Seinlin/gerrit,Seinlin/gerrit,MerritCR/merrit,TonyChai24/test,thinkernel/gerrit,thesamet/gerrit,gerrit-review/gerrit,pkdevbox/gerrit,Distrotech/gerrit,supriyantomaftuh/gerrit,WANdisco/gerrit,dwhipstock/gerrit,hdost/gerrit,quyixia/gerrit,joshuawilson/merrit,joshuawilson/merrit,renchaorevee/gerrit,pkdevbox/gerrit,supriyantomaftuh/gerrit,WANdisco/gerrit,Distrotech/gerrit,supriyantomaftuh/gerrit,MerritCR/merrit,gcoders/gerrit,renchaorevee/gerrit,WANdisco/gerrit,MerritCR/merrit,anminhsu/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,anminhsu/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,quyixia/gerrit,jackminicloud/test,joshuawilson/merrit,qtproject/qtqa-gerrit,renchaorevee/gerrit,gerrit-review/gerrit,gcoders/gerrit,GerritCodeReview/gerrit,TonyChai24/test,Seinlin/gerrit,jackminicloud/test,MerritCR/merrit,pkdevbox/gerrit,dwhipstock/gerrit,Overruler/gerrit,gcoders/gerrit,joshuawilson/merrit,gcoders/gerrit,supriyantomaftuh/gerrit,thinkernel/gerrit,jackminicloud/test,hdost/gerrit,Overruler/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,Seinlin/gerrit,hdost/gerrit,quyixia/gerrit,dwhipstock/gerrit,TonyChai24/test,Seinlin/gerrit,jackminicloud/test,hdost/gerrit,supriyantomaftuh/gerrit,joshuawilson/merrit,netroby/gerrit,TonyChai24/test,renchaorevee/gerrit,dwhipstock/gerrit,quyixia/gerrit,gerrit-review/gerrit,dwhipstock/gerrit,Distrotech/gerrit,thesamet/gerrit,anminhsu/gerrit,thinkernel/gerrit,thinkernel/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,dwhipstock/gerrit,GerritCodeReview/gerrit,TonyChai24/test,supriyantomaftuh/gerrit,WANdisco/gerrit,thesamet/gerrit,quyixia/gerrit,Overruler/gerrit,qtproject/qtqa-gerrit,hdost/gerrit,hdost/gerrit,gcoders/gerrit,pkdevbox/gerrit,Distrotech/gerrit,Distrotech/gerrit,renchaorevee/gerrit,TonyChai24/test,thesamet/gerrit,gerrit-review/gerrit,netroby/gerrit,GerritCodeReview/gerrit,thesamet/gerrit,netroby/gerrit,Distrotech/gerrit,netroby/gerrit,MerritCR/merrit,Seinlin/gerrit,WANdisco/gerrit,TonyChai24/test,netroby/gerrit,jackminicloud/test,gerrit-review/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,Overruler/gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,thinkernel/gerrit,quyixia/gerrit,pkdevbox/gerrit,renchaorevee/gerrit,GerritCodeReview/gerrit,dwhipstock/gerrit,pkdevbox/gerrit,gerrit-review/gerrit,renchaorevee/gerrit,supriyantomaftuh/gerrit,thesamet/gerrit,GerritCodeReview/gerrit,jackminicloud/test,gcoders/gerrit,pkdevbox/gerrit,thesamet/gerrit,anminhsu/gerrit,gcoders/gerrit