Add a little more material to the new section about evaluation order.
Add a little more material to the new section about evaluation order.

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