Small improvements to user's guide description of arrays.
Small improvements to user's guide description of arrays.

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