Further polishing of documentation about new fmgr call convention.
Further polishing of documentation about new fmgr call convention.

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