ChangeScreen2: list download commands in migration doc
ChangeScreen2: list download commands in migration doc

Explicitly mention checkout, pull, and cherry-pick in the intro to the
new change screen to make it easier for people used to the old change
screen to find their new location.

Change-Id: I1cc687624a6b6486ae899e16612727e07b338ee2

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