Fix syntax in extract() examples
Fix syntax in extract() examples

Author: Erik Rijkers <602c57ffb51af99d6f3b54c0ee9587bb110fb990@xs4all.nl>

lintzc/gpdb,royc1/gpdb,Quikling/gpdb,chrishajas/gpdb,0x0FFF/gpdb,rvs/gpdb,royc1/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,lisakowen/gpdb,jmcatamney/gpdb,50wu/gpdb,Chibin/gpdb,50wu/gpdb,lintzc/gpdb,chrishajas/gpdb,adam8157/gpdb,edespino/gpdb,xinzweb/gpdb,xinzweb/gpdb,janebeckman/gpdb,zaksoup/gpdb,lintzc/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,rvs/gpdb,kaknikhil/gpdb,adam8157/gpdb,xinzweb/gpdb,xuegang/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,0x0FFF/gpdb,lisakowen/gpdb,janebeckman/gpdb,0x0FFF/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,xuegang/gpdb,xinzweb/gpdb,chrishajas/gpdb,adam8157/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,Quikling/gpdb,adam8157/gpdb,Quikling/gpdb,cjcjameson/gpdb,zaksoup/gpdb,yuanzhao/gpdb,zaksoup/gpdb,greenplum-db/gpdb,50wu/gpdb,rvs/gpdb,CraigHarris/gpdb,lintzc/gpdb,janebeckman/gpdb,royc1/gpdb,ahachete/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,janebeckman/gpdb,Quikling/gpdb,50wu/gpdb,xuegang/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,Chibin/gpdb,janebeckman/gpdb,edespino/gpdb,royc1/gpdb,zaksoup/gpdb,Chibin/gpdb,Chibin/gpdb,Chibin/gpdb,ashwinstar/gpdb,ahachete/gpdb,lintzc/gpdb,greenplum-db/gpdb,lisakowen/gpdb,Quikling/gpdb,xinzweb/gpdb,ashwinstar/gpdb,Quikling/gpdb,edespino/gpdb,jmcatamney/gpdb,Quikling/gpdb,edespino/gpdb,royc1/gpdb,adam8157/gpdb,lintzc/gpdb,Chibin/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,ahachete/gpdb,ahachete/gpdb,edespino/gpdb,xinzweb/gpdb,Chibin/gpdb,ashwinstar/gpdb,lintzc/gpdb,janebeckman/gpdb,Quikling/gpdb,ahachete/gpdb,lisakowen/gpdb,greenplum-db/gpdb,lisakowen/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,zaksoup/gpdb,xuegang/gpdb,CraigHarris/gpdb,Chibin/gpdb,lintzc/gpdb,Quikling/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,0x0FFF/gpdb,xuegang/gpdb,adam8157/gpdb,xinzweb/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,chrishajas/gpdb,rvs/gpdb,chrishajas/gpdb,chrishajas/gpdb,janebeckman/gpdb,rvs/gpdb,ahachete/gpdb,lisakowen/gpdb,zaksoup/gpdb,adam8157/gpdb,0x0FFF/gpdb,zaksoup/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,edespino/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,rvs/gpdb,zaksoup/gpdb,lisakowen/gpdb,edespino/gpdb,xuegang/gpdb,ahachete/gpdb,jmcatamney/gpdb,janebeckman/gpdb,yuanzhao/gpdb,rvs/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,royc1/gpdb,yuanzhao/gpdb,edespino/gpdb,50wu/gpdb,50wu/gpdb,rvs/gpdb,Chibin/gpdb,CraigHarris/gpdb,Quikling/gpdb,xinzweb/gpdb,ahachete/gpdb,edespino/gpdb,yuanzhao/gpdb,50wu/gpdb,adam8157/gpdb,lisakowen/gpdb,xuegang/gpdb,cjcjameson/gpdb,janebeckman/gpdb,Chibin/gpdb,jmcatamney/gpdb,edespino/gpdb,chrishajas/gpdb,rvs/gpdb,janebeckman/gpdb,jmcatamney/gpdb,50wu/gpdb,xuegang/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,royc1/gpdb,xuegang/gpdb,royc1/gpdb,rvs/gpdb,cjcjameson/gpdb,0x0FFF/gpdb,chrishajas/gpdb,lintzc/gpdb