Update some obsolete comments --- code is using t_self now, not t_ctid.
Update some obsolete comments --- code is using t_self now, not t_ctid.

pavanvd/postgres-xl,ahachete/gpdb,CraigHarris/gpdb,snaga/postgres-xl,ahachete/gpdb,zeroae/postgres-xl,arcivanov/postgres-xl,0x0FFF/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,edespino/gpdb,atris/gpdb,kaknikhil/gpdb,edespino/gpdb,lisakowen/gpdb,lisakowen/gpdb,Chibin/gpdb,lisakowen/gpdb,adam8157/gpdb,yuanzhao/gpdb,lisakowen/gpdb,lintzc/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,tangp3/gpdb,0x0FFF/gpdb,foyzur/gpdb,foyzur/gpdb,edespino/gpdb,CraigHarris/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,lisakowen/gpdb,greenplum-db/gpdb,xuegang/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,rvs/gpdb,tangp3/gpdb,jmcatamney/gpdb,kaknikhil/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,50wu/gpdb,ahachete/gpdb,rubikloud/gpdb,Quikling/gpdb,randomtask1155/gpdb,zaksoup/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,zaksoup/gpdb,janebeckman/gpdb,50wu/gpdb,lisakowen/gpdb,lintzc/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,oberstet/postgres-xl,pavanvd/postgres-xl,edespino/gpdb,Chibin/gpdb,Chibin/gpdb,zeroae/postgres-xl,arcivanov/postgres-xl,kaknikhil/gpdb,yazun/postgres-xl,royc1/gpdb,janebeckman/gpdb,Chibin/gpdb,zeroae/postgres-xl,atris/gpdb,techdragon/Postgres-XL,Chibin/gpdb,kaknikhil/gpdb,rubikloud/gpdb,oberstet/postgres-xl,janebeckman/gpdb,lisakowen/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,royc1/gpdb,edespino/gpdb,royc1/gpdb,rvs/gpdb,zaksoup/gpdb,rubikloud/gpdb,50wu/gpdb,royc1/gpdb,xuegang/gpdb,atris/gpdb,Chibin/gpdb,edespino/gpdb,zeroae/postgres-xl,rubikloud/gpdb,Chibin/gpdb,foyzur/gpdb,janebeckman/gpdb,xuegang/gpdb,rvs/gpdb,jmcatamney/gpdb,50wu/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,techdragon/Postgres-XL,cjcjameson/gpdb,jmcatamney/gpdb,tangp3/gpdb,janebeckman/gpdb,yazun/postgres-xl,xuegang/gpdb,0x0FFF/gpdb,zeroae/postgres-xl,Postgres-XL/Postgres-XL,xuegang/gpdb,Quikling/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,oberstet/postgres-xl,tangp3/gpdb,tangp3/gpdb,chrishajas/gpdb,cjcjameson/gpdb,lintzc/gpdb,cjcjameson/gpdb,rubikloud/gpdb,postmind-net/postgres-xl,lpetrov-pivotal/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,janebeckman/gpdb,Quikling/gpdb,zaksoup/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,50wu/gpdb,oberstet/postgres-xl,pavanvd/postgres-xl,yuanzhao/gpdb,randomtask1155/gpdb,pavanvd/postgres-xl,foyzur/gpdb,rubikloud/gpdb,ahachete/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,postmind-net/postgres-xl,Quikling/gpdb,50wu/gpdb,greenplum-db/gpdb,royc1/gpdb,chrishajas/gpdb,50wu/gpdb,CraigHarris/gpdb,50wu/gpdb,chrishajas/gpdb,ovr/postgres-xl,greenplum-db/gpdb,Quikling/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,tangp3/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,rvs/gpdb,foyzur/gpdb,pavanvd/postgres-xl,kmjungersen/PostgresXL,randomtask1155/gpdb,lisakowen/gpdb,ovr/postgres-xl,snaga/postgres-xl,Chibin/gpdb,tpostgres-projects/tPostgres,rubikloud/gpdb,0x0FFF/gpdb,rvs/gpdb,atris/gpdb,ashwinstar/gpdb,Chibin/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,royc1/gpdb,adam8157/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,atris/gpdb,kmjungersen/PostgresXL,chrishajas/gpdb,postmind-net/postgres-xl,edespino/gpdb,ahachete/gpdb,Quikling/gpdb,lintzc/gpdb,yazun/postgres-xl,yazun/postgres-xl,yuanzhao/gpdb,lpetrov-pivotal/gpdb,jmcatamney/gpdb,Quikling/gpdb,lintzc/gpdb,ahachete/gpdb,edespino/gpdb,techdragon/Postgres-XL,rvs/gpdb,royc1/gpdb,xuegang/gpdb,kaknikhil/gpdb,janebeckman/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,janebeckman/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,janebeckman/gpdb,xuegang/gpdb,edespino/gpdb,xinzweb/gpdb,oberstet/postgres-xl,edespino/gpdb,royc1/gpdb,ashwinstar/gpdb,atris/gpdb,ashwinstar/gpdb,zaksoup/gpdb,lintzc/gpdb,rvs/gpdb,yuanzhao/gpdb,tangp3/gpdb,randomtask1155/gpdb,chrishajas/gpdb,ashwinstar/gpdb,ahachete/gpdb,rvs/gpdb,Chibin/gpdb,lpetrov-pivotal/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lintzc/gpdb,kaknikhil/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,foyzur/gpdb,atris/gpdb,xuegang/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,foyzur/gpdb,ashwinstar/gpdb,xinzweb/gpdb,rubikloud/gpdb,Postgres-XL/Postgres-XL,cjcjameson/gpdb,0x0FFF/gpdb,adam8157/gpdb,chrishajas/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,atris/gpdb,kmjungersen/PostgresXL,kmjungersen/PostgresXL,yazun/postgres-xl,janebeckman/gpdb,CraigHarris/gpdb,adam8157/gpdb,kaknikhil/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,randomtask1155/gpdb,zaksoup/gpdb,snaga/postgres-xl,ovr/postgres-xl,zaksoup/gpdb,tpostgres-projects/tPostgres,foyzur/gpdb,xinzweb/gpdb,jmcatamney/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,snaga/postgres-xl,zaksoup/gpdb,postmind-net/postgres-xl,snaga/postgres-xl,adam8157/gpdb,lintzc/gpdb,Quikling/gpdb,CraigHarris/gpdb,chrishajas/gpdb,tangp3/gpdb,lintzc/gpdb,xuegang/gpdb,rvs/gpdb,xinzweb/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,yuanzhao/gpdb,chrishajas/gpdb,xinzweb/gpdb