Reformat index documentation
Reformat index documentation

Move the paragraphs about running the reindex program and the index
names up to the top of the index section.  It makes more sense to
have them there, than in the middle of the setting descriptions.

Change-Id: I875a66173f752554803ca95bc166fba0dfbcd315

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