Fix atan() description.
Fix atan() description.

Bruno Wolff III

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