Fix typos in comments.
Fix typos in comments.

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