Update documentation regarding tag deletion
Update documentation regarding tag deletion

The documentation says tags cannot be deleted. This seems not to be
the case.

Change-Id: I3d3838d7468fddf2605f1398ca01c776c03d116c

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