Fix typo in usage message, per Oleg.
Fix typo in usage message, per Oleg.

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